2017-2018学年深圳市龙岗区小学四年级数学上学期期末考试试卷及答案

<strong><span>一、选择题.(30分,每题2分)</span></strong><br><br><span>1.(2分)下面各数中,只读一个零的是(  )</span><br><br><span>A.9007800</span><span>  </span><span>B.5000550</span>  <span>C.6080900</span>  <span>D.3070008</span><br><br><font color="#ff0000"><span>【分析】</span><span>整数的读法:从高位到低位,一级一级地读,每一级末尾的0都不读出来,其余数位连续几个0都只读一个零,解答即可.</span><br><br><span>【解答】</span><span>解:A、9007800读作:九百万七千八百;</span><br><br><span>B、5000550读作:五百万零五百五十;</span><br><br><span>C、6080900读作:六百零八万零九百;</span><br><br><span>D、3070008读作:三百零七万零八.</span><br><br><span>故选:B.</span></font><br><br><span>2.(2分)计算器上的清除键是(  )</span><br><br><span>A.M</span><span>+</span>  <span>B.=</span>  <span>C.CE</span>  <span>D.﹣</span><br><br><font color="#ff0000"><span>【分析】</span><span>在计算器上,ON表示开机键,OFF表示关机键,ON/CE表示开机及清除键.据此解答即可.</span><br><br><span>【解答】</span><span>解:CE是清除键.</span><br><br><span>故选:C.</span></font><br><br><span>3.(2分)要使9□418</span><span>≈</span><span>10万,□里不能填(  )</span><br><br><span>A.4</span>  <span>B.5</span>  <span>C.6</span>  <span>D.7</span><br><br><font color="#ff0000"><span>【分析】</span><span>省略万位后面的尾数求近似数,根据千位上数字的大小确定用“四舍”、还是用</span><span>“五入”.要使9□418</span><span>≈</span><span>10万,显然是用“五入”法得到的近似数,所以□里最大填9,最小填5的数.</span><br><br><span>【解答】</span><span>解:要使9□418</span><span>≈</span><span>10万,显然是用“五入”法得到的近似数,所以□里填大于5或等于5的数.</span><br><br><span>故选:A.</span></font><br><br><span>4.(2分)39</span><span>×</span><span>61的积最接近(  )</span><br><br><span>A.1500</span>  <span>B.1800</span>  <span>C.2400</span>  <span>D.2000</span><br><br><font color="#ff0000"><span>【分析】</span><span>计算39</span><span>×</span><span>61时,把39看作40,61看作60进行计算解答即可.</span><br><br><span>【解答】</span><span>解:39</span><span>×</span><span>61</span><br><br><span>≈</span><span>40</span><span>×</span><span>60</span><br><br><span>=2400;</span><br><br><span>故选:C.</span></font><br><br><span>5.(2分)如果气球上升18米,记作</span><span>+</span><span>18米,那么下降5米,记作(  )</span><br><br><span>A.</span><span>+</span><span>5米</span>  <span>B.&#65498;5米</span>  <span>C.</span><span>+</span><span>8米</span>  <span>D.&#65498;8米</span><br><br><font color="#ff0000"><span>【分析】</span><span>此题主要用正负数来表示具有意义相反的两种量:上升记为正,则下降就记为负,直接得出结论即可.</span><br><br><span>【解答】</span><span>解:如果气球上升18米,记作</span><span>+</span><span>18米,那么下降5米,记作﹣5米;</span><br><br><span>故选:B.</span></font><br><br><span>6.(2分)线段有(  )端点.</span><br><br><span>A.1个</span>  <span>B.2个</span>  <span>C.没有</span>  <span>D.无数个</span><br><br><font color="#ff0000"><span>【分析】</span><span>根据线段的特点:线段有两个端点,长度可以测量.</span><br><br><span>【解答】</span><span>解:由线段的特点:线段有2个端点.</span><br><br><span>故选:B.</span></font><br><br><span>7.(2分)如图的长方形中,下面说法,错误的是(  )</span><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/201822623241.png?m=0.3425799358925248"><br><br><span>A.a和c平行</span><span>  </span><span>B.b和d平行</span>  <span>C.a和d相交</span>  <span>D.b和c不相交</span><br><br><font color="#ff0000"><span>【分析】</span><span>根据平行线和互相垂直的定义:在同一平面内永不相交的两条直线叫做平行线;当两条直线相交成90度时,这两条直线就互相垂直;据此解答即可.</span><br><br><span>【解答】</span><span>解:根据平行线和互相垂直的定义可知:</span><br><br><span>A、a与c互相平行,所以A说法正确;</span><br><br><span>B、b与d互相平行,所以B说法正确;</span><br><br><span>C、a与d相交,所以说法正确</span><br><br><span>D、b和c相交,所以说法错误;</span><br><br><span>故选:D.</span></font><br><br><span>8.(2分)下列图形没有直角的是(  )</span><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/201822623340.png?m=0.5952672958377485"><br><br><font color="#ff0000"><span>【分析】</span><span>根据平行四边形、长方形、三角形、梯形的含义:两组对边分别平行的四边形是平行四边形;有一个角是直角的平行四边形是长方形;有一个角是直角的三角形是直角三角形;只有一组对边平行的四边形是梯形;有一个角是直角的梯形是直角梯形;由此可知:长方形、直角三角形、直角梯形中一定有直角;平行四边形中一定没有直角,如果有直角,就变成长方形.</span><br><br><span>【解答】</span><span>解:长方形、直角三角形、直角梯形中一定有直角;平行四边形中一定没有直角;</span><br><br><span>故选:B.</span></font><br><br><span>9.(2分)4时半,钟面上的分针和时针所成角是(  )角.</span><br><br><span>A.锐角</span><span>  </span><span>B.直角</span>  <span>C.平角</span>  <span>D.周角</span><br><br><font color="#ff0000"><span>【分析】</span><span>分针每分钟转360°</span><span>÷</span><span>60=6°,时针每分钟转6°</span><span>×</span><span>=0.5°;4点整时,分针和时针成30°</span><span>×</span><span>4=120°的角,30分钟后分针转了6°</span><span>×</span><span>30=180°,时针转了0.5°</span><span>×</span><span>30=15°,则到4点30分时,时针和分针组成的较小的角度是:180°﹣120°﹣15°=45°;然后解答即可.</span><br><br><span>【解答】</span><span>解:4点整时,分针和时针成30°</span><span>×</span><span>4=120°的角,</span><br><br><span>30分钟后分针转了6°</span><span>×</span><span>30=180°,时针转了0.5°</span><span>×</span><span>30=15°,</span><br><br><span>则到4点30分时,时针和分针组成的较小的角度是:180°﹣120°﹣15°=45°;</span><br><br><span>所以此时时针与分针的夹角是锐角.</span><br><br><span>故选:A.</span></font><br><br><span>10.(2分)如图</span><span>∠</span><span>1=(  )</span><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/201822623447.png?m=0.9920233161383523"><br><br><span>A.75°</span><span></span><span>B.85°</span><span></span><span>C.105°</span><span></span><span>D.115°</span><br><br><font color="#ff0000"><span>【分析】</span><span>度量方法:</span><br><br><span>量角要注意两对齐:量角器的中心和角的顶点对齐. </span><br><br><span>量角器的0刻度线和角的一条边对齐. </span><br><br><span>做到两对齐后看角的另一条边对着刻度线几,这个角就是几度.</span><br><br><span>【解答】</span><span>解:如图</span><span>∠</span><span>1=105°</span></font><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/201822623539.png?m=0.15571549088083003"><br><br><span><font color="#ff0000">故选:C.</font></span><br><br><span>11.(2分)数对(5,8)表示(  )</span><br><br><span>A.第5列第8行</span><span>  </span><span>B.第5行第8列</span>  <span>C.第8列第5行</span>  <span>D.第8行第5列</span><br><br><font color="#ff0000"><span>【分析】</span><span>数对表示位置的方法是:第一个数字表示列,第二个数字表示行,由此即可解答问题.</span><br><br><span>【解答】</span><span>解:根据数对表示位置的方法可得:数对(5,8)表示的位置是第5列、第8行;</span><br><br><span>故选:A.</span></font><br><br><span>12.(2分)从扑克牌“2,3,4,5,6,7”中任意抽一张牌,抽到小于4的牌比抽到大于4的牌的可能性(  )</span><br><br><span>A.大</span>  <span>B.小</span>  <span>C.相等</span>  <span>D.无法确定</span><br><br><font color="#ff0000"><span>【分析】</span><span>从扑克牌“2,3,4,5,6,7”中找出小于4的牌与大于4的牌的张数,再比较大小,张数多的抽到的可能性大.</span><br><br><span>【解答】</span><span>解:扑克牌“2,3,4,5,6,7”中,</span><br><br><span>小于4的牌有“2,3”2张,</span><br><br><span>大于4的牌有“5,6,7”3张,</span><br><br><span>2</span><span><</span><span>3,</span><br><br><span>所以抽到小于4的牌比抽到大于4的牌的可能性小.</span><br><br><span>故选:B.</span></font><br><br><span>13.(2分)王强的身份证号是210203198207230251,他的出生年月日是(  )</span><br><br><span>A.1982年7月23日</span>  <span>B.1982年3月25日</span><br><br><span>C.2002年7月23日</span>  <span>D.2002年3月25日</span><br><br><font color="#ff0000"><span>【分析】</span><span>身份证的第7</span><span>~</span><span>14位表示出生日期,其中第7</span><span>~</span><span>10位是出生的年份,11、12位是出生的月份,第13、14位是出生的日;据此解答.</span><br><br><span>【解答】</span><span>解:王强的身份证号是210203198207230251,第7</span><span>~</span><span>14位是:19820723,他的出生日期就是1982年7月23日.</span><br><br><span>故选:A.</span></font><br><br><span>14.(2分)如果一条路上有7个公共汽车站,单程需要准备(  )种不同的车票.</span><br><br><span>A.15</span>  <span>B.21</span>  <span>C.28</span>  <span>D.36</span><br><br><font color="#ff0000"><span>【分析】</span><span>假设从A站到B站(单程)一共停7个站,相当于两两握手,每站都与其它6个站有6种组合,由于是单程,所以要去掉重复的,根据握手公式n</span><span>×</span><span>(n﹣1)</span><span>÷</span><span>2解答即可.</span><br><br><span>【解答】</span><span>解:(7﹣1)</span><span>×</span><span>7</span><span>÷</span><span>2</span><br><br><span>=42</span><span>÷</span><span>2</span><br><br><span>=21(</span><span>种)</span><br><br><span>答:单程需要准备21种不同的车票.</span><br><br><span>故选:B.</span></font><br><br><span>15.(2分)已知1</span><span>×</span><span>9</span><span>+</span><span>2=11,12</span><span>×</span><span>9</span><span>+</span><span>3=111,123</span><span>×</span><span>9</span><span>+</span><span>4=1111,下面的式子是(  )</span><br><br><span>A.1234</span><span>×</span><span>9</span><span>+</span><span>4=11111</span>  <span>B.1234</span><span>×</span><span>9</span><span>+</span><span>5=11111</span><br><br><span>C.1234</span><span>×</span><span>9</span><span>+</span><span>5=1111</span>  <span>D.1234</span><span>×</span><span>9</span><span>+</span><span>5=111111</span><br><br><font color="#ff0000"><span>【分析】</span><span>这几个算式的特征是:加数分</span><span>别是2、3、4…,第二个因数都是9,第一个因数分别是1、12、123…算式的计算结果都是1,且1的个数与加数相同.据即即可确定后面一个算式.</span><br><br><span>【解答】</span><span>解:已知1</span><span>×</span><span>9</span><span>+</span><span>2=11,12</span><span>×</span><span>9</span><span>+</span><span>3=111,123</span><span>×</span><span>9</span><span>+</span><span>4=1111,下面的式子是:1234</span><span>×</span><span>9</span><span>+</span><span>5=11111.</span><br><br><span>故选:B.</span></font><br><br><strong><span>二、填空题(15分,每空1分)</span></strong><br><br><span>16.(1分)中国国家统计局公布,至2005年11月1日零时,中国总人口中的男性人数为</span><span style="text-decoration:underline"><span> 六亿七千三百零九万 </span></span><span>,横线上的数写作:</span><span style="text-decoration:underline"><span> 6 7309 0000 </span></span><span>.</span><br><br><font color="#ff0000"><span>【分析】</span><span>根据整数的写法:从高位到低位,一级一级地写,哪一个数位上一个计数单位也没有,就在那个数位上写0,据此写出.</span><br><br><span>【解答】</span><span>解:六亿七千三百零九万写作:6 7309 0000.</span><br><br><span>故答案为:6 7309 0000.</span></font><br><br><span>17.(1分)一个数是由6个百万,8个千和3个十组成的,这个数是</span><span style="text-decoration:underline"><span> 6008030 </span></span><span>.</span><br><br><font color="#ff0000"><span>【分析】</span><span>根据整数的写法,从高位到低位,一级一级地写,哪一个数位上一个单位也没有,就在那个数位上写0,即可写出此数.</span><br><br><span>【解答】</span><span>解:一个数是由6个百万,8个千和3个十组成的,这个数是:6008030.</span><br><br><span>故答案为:6008030.</span></font><br><br><span>18.(1分)一天,深圳的气温是15</span><span>~</span><span>22℃,表示这天深圳的最高气温是</span><span style="text-decoration:underline"><span> 22℃ </span></span><span>.</span><br><br><font color="#ff0000"><span>【分析】</span><span>15</span><span>~</span><span>22℃表示温度是从15℃到22℃,据此即可得这天深圳的最高气温.</span><br><br><span>【解答】</span><span>解:一天,深圳</span><span>的气温是15</span><span>~</span><span>22℃,表示这天深圳的最高气温是22℃,</span><br><br><span>故答案为:22℃.</span></font><br><br><span>19.(1分)47</span><span>×</span><span>4</span><span>+</span><span>63</span><span>×</span><span>4=(47</span><span>+</span><span>63)</span><span>×</span><span>4运用的是</span><span style="text-decoration:underline"><span> 乘法分配 </span></span><span>律.</span><br><br><font color="#ff0000"><span>【分析】</span><span>根据题意,47和63都与4相乘,可以先求出47与63的和,再与4相乘,运用乘法分配律进行简便计算.</span><br><br><span>【解答】</span><span>解:47</span><span>×</span><span>4</span><span>+</span><span>63</span><span>×</span><span>4</span><br><br><span>=(47</span><span>+</span><span>63)</span><span>×</span><span>4</span><br><br><span>=110</span><span>×</span><span>4</span><br><br><span>=440;</span><br><br><span>运用乘法分配律进行简便计算.</span><br><br><span>故答案为:乘法分配.</span></font><br><br><span>20.(1分)249005024四舍五入到万位是</span><span style="text-decoration:underline"><span> 24901万 </span></span><span>.</span><br><br><font color="#ff0000"><span>【分析】</span><span>把一个数“四舍五入”到万位,要看这个数的千位上的数是几,如果小于5,则直接舍去,如果大于或等于5,则向前一位进一,然后把后面的数舍去,再在后面添个“万”字.据此解答.</span><br><br><span>【解答】</span><span>解:249005024的千位上的数是5,要进1,所以249005024</span><span>≈</span><span>24901万</span><br><br><span>故答案为:24901万.</span></font><br><br><span>21.(1分)1440</span><span>÷</span><span style="text-decoration:underline"><span> 120 </span></span><span>=144</span><span>÷</span><span>12=12.</span><br><br><font color="#ff0000"><span>【分析】</span><span>被除数和除数同时扩大(或缩小)相同倍数(0除外),商不变.据此解答即可.</span><br><br><span>【解答】</span><span>解:1440</span><span>÷</span><span>120=144</span><span>÷</span><span>12=12.</span><br><br><span>故答案为:120.</span></font><br><br><span>22.(1分)火车16小时行驶了1184千米,汽车10小时行驶450千米,</span><span style="text-decoration:underline"><span> 火 </span></span><span>车的速度快.</span><br><br><font color="#ff0000"><span>【分析】</span><span>火车16小时行驶了1184千米,汽车10小时行驶450千米,根据路程</span><span>÷</span><span>时间=速度,分别求出火车和汽车的速度,二者比较即可.</span><br><br><span>【解答】</span><span>解:1184</span><span>÷</span><span>16=74(千米)</span><br><br><span>450</span><span>÷</span><span>10=45(千米)</span><br><br><span>74</span><span>></span><span>45</span><br><br><span>所以火车比汽车跑得快.</span><br><br><span>答:火车跑的快.</span><br><br><span>故答案为:火.</span></font><br><br><span>23.(1分)在一个装有5枚红棋子、3枚黄棋子和1枚白棋子的口袋里任意摸出1枚棋子,摸到</span><span style="text-decoration:underline"><span> 红 </span></span><span>棋子的可能性最大.</span><br><br><font color="#ff0000"><span>【分析】</span><span>因为棋子的总数一定,棋子越少,摸到的可能性就越小,棋子数越多,摸到的可能性就越大,据此即可求解.</span><br><br><span>【解答】</span><span>解:因为5</span><span>></span><span>3</span><span>></span><span>1,说明盒子里红棋子的个数最多,所以随意摸出1枚棋子,摸出红棋子的可能性最大;</span><br><br><span>答:摸到红棋子的可能性最大.</span><br><br><span>故答案为:红.</span></font><br><br><span>24.(1分)小猫家的位置是(1,1),小兔家的位置是(5,5).小兔家的位置是在小猫家的</span><span style="text-decoration:underline"><span> 东北 </span></span><span>方向上.</span><br><br><font color="#ff0000"><span>【分析】</span><span>数对表示位置的方法是:第一个数字表示列,第二个数字表示行,由此即可在平面图中标出它们的位置,然后判断位置关系即可.</span><br><br><span>【解答】</span><span>解:根据分析画图如下,</span><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/201822623846.png?m=0.7689519385093089"><br><br><span>由上图可知,小兔家的位置是在小猫家的 东北方向上.</span><br><br><span>故答案为:东北.</span></font><br><br><span>25.(2分)□</span><span>÷</span><span>28=15…□,当余数是</span><span style="text-decoration:underline"><span> 27 </span></span><span>时,被除数最大,被除数是</span><span style="text-decoration:underline"><span> 447 </span></span><span>.</span><br><br><font color="#ff0000"><span>【分析】</span><span>根据在有余数的除法中,余数总比除数小,即余数最大为:除数﹣1,当余数最大时,被除数最大,进而根据“被除数=商</span><span>×</span><span>除数</span><span>+</span><span>余数”解答即可.</span><br><br><span>【解答】</span><span>解:28﹣1=27</span><br><br><span>15</span><span>×</span><span>28</span><span>+</span><span>27</span><br><br><span>=420</span><span>+</span><span>27</span><br><br><span>=447</span><br><br><span>答:当余数是27时,被除数最大,被除数是447;</span><br><br><span>故答案为:27,447.</span></font><br><br><span>26.(4分)同学们到广场上参加活动,小明从学校出发向</span><span style="text-decoration:underline"><span> 东南 </span></span><span>方向走</span><span style="text-decoration:underline"><span> 300 </span></span><span>米到广场,小红从少年宫出发向</span><span style="text-decoration:underline"><span> 西北 </span></span><span>方向走</span><span style="text-decoration:underline"><span> 200 </span></span><span>米到广场.</span><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/201822623942.png?m=0.06566067497655736"><br><br><font color="#ff0000"><span>【分析】</span><span>根据平面图上方向的规定:上北下南,左西右东,小明从学校出发向走即可到达广场,学校与广场的距离图中已标出;小红从少年宫出发向西北方向走即可到达广场,少年宫与广场的距离图中已标出.</span><br><br><span>【解答】</span><span>解:如图</span></font><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/2018226231030.png?m=0.4278735197421899"><br><br><font color="#ff0000"><span>同学们到广场上参加活动,小明从学校出发向 东南方向走 300米到广场,小红从少年宫出发向 西北方向走</span><span>&nbsp;200米到广场.</span><br><br><span>故答案为:东南,300,西北,200.</span></font><br><br><strong><span>三、计算题(23分)</span></strong><br><br><span>27.(8分)直接写出得数:</span><div><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/2018226231129.png?m=0.6301336297752373"><br><br><font color="#ff0000"><span>【分析】</span><span>根据整数乘除法的计算方法及估算方法进行计算即可,20</span><span>×</span><span>24</span><span>×</span><span>5运用乘法的交换律进行简算.</span><br><br><span>【解答】</span><span>解:</span></font><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/2018226231221.png?m=0.23900465519258973"><br><br><span>28.(6分)用竖式计算</span><br><br><span>408</span><span>×</span><span>15=</span><br><br><span>432</span><span>÷</span><span>27=</span><br><br><span>897</span><span>÷</span><span>72=</span><br><br><font color="#ff0000"><span>【分析】</span><span>根据整数乘除法的竖式计算方法进行解答即可.</span><br><br><span>【解答】</span><span>解:408</span><span>×</span><span>15=6120;</span></font><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/2018226231328.png?m=0.9572027770130311"><br><br><span>29.(9分)用你喜欢的方法计算</span><br><br><span>199</span><span>×</span><span>48</span><span>+</span><span>48 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><br><br><span>26</span><span>×</span><span>8</span><span>×</span><span>125 </span><br><br><span>720</span><span>÷[</span><span>(12</span><span>+</span><span>24)</span><span>×</span><span>20</span><span>]</span><span>.</span><br><br><font color="#ff0000"><span>【分析】</span><span>(1)根据乘法分配律进行简算;</span><br><br><span>(2)根据乘法结合律进行简算;</span><br><br><span>(3)先算小括号里面的加法,再算中括号里面的乘法,最后算除法.</span><br><br><span>【解答】</span><span>解:(1)199</span><span>×</span><span>48</span><span>+</span><span>48</span><br><br><span>=(199</span><span>+</span><span>1)</span><span>×</span><span>48</span><br><br><span>=200</span><span>×</span><span>48</span><br><br><span>=9600;</span><br><br><br><span>(2)26</span><span>×</span><span>8</span><span>×</span><span>125</span><br><br><span>=26</span><span>×</span><span>(8</span><span>×</span><span>125)</span><br><br><span>=26</span><span>×</span><span>1000</span><br><br><span>=26000;</span><br><br><br><span>(3)720</span><span>÷[</span><span>(12</span><span>+</span><span>24)</span><span>×</span><span>20</span><span>]</span><br><br><span>=720</span><span>÷[</span><span>36</span><span>×</span><span>20</span><span>]</span><br><br><span>=720</span><span>÷</span><span>720</span><br><br><span>=1.</span><br></font><br><strong><span>四、作图题(7分)</span></strong><br><br><span>30.(3分)画一个150度的角.</span><br><br><span>【分析】</span><span>①</span><span>画一条射线,中心点对准射线的端点,0刻度线对准射线(两重合); </span><br><br><span>②</span><span>对准量角器150°(或其它角的度数)的刻度线点一个点(找点); </span><br><br><span>③</span><span>把点和射线端点连接,然后标出角的度数.</span><br><br><span>【解答】</span><span>解:作图如下:</span><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/2018226231426.png?m=0.8744727151078742"><br><br><span>31.(4分)看图画一画::</span><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/2018226231459.png?m=0.6231184698115781"><br><br><span>(1)超市西面50米处有一家书店,请用“◆”标出书店的位置.</span><br><br><span>(2)书店北面30米处有一所学校,请用“☆”标出学校的位置.</span><br><br><font color="#ff0000"><span>【分析】</span><span>(1)根据利用方向和距离表示物体位置的方法,首先确定方向,再根据比例尺确定距离,据此解答.</span><br><br><span>(2)根据利用方向和距离表示物体位置的方法,首先确定方向,再根据比例尺确定距离,据此</span><span>解答.</span><br><br><span>【解答】</span><span>解:作图如下:</span></font><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/2018226231538.png?m=0.9037062423712399"><br><br><strong><span>五、应用题.(25分)</span></strong><br><br><span>32.(5分)张阿姨花了108元买了18千克苹果,李阿姨花了120元买了24千克苹果,谁买的苹果便宜?</span><br><br><font color="#ff0000"><span>【分析】</span><span>先根据“单价=总价</span><span>÷</span><span>数量”分别求出她俩买苹果的单价,再比较它们的大小,单价小的便宜一些.</span><br><br><span>【解答】</span><span>解:张阿姨买苹果的单价为:108</span><span>÷</span><span>18=6(元/千克),</span><br><br><span>李阿姨买苹果的单价为:120</span><span>÷</span><span>24=5(元/千克),</span><br><br><span>6</span><span>></span><span>5;</span><br><br><span>答:李阿姨买的苹果便宜一些.</span></font><br><br><span>33.(5分)光明小学有5位老师带着145名四年级学生去参观科技馆. 儿童票,每位16元;成人票,每位28元. 带2500元钱买门票够不够?</span><br><br><font color="#ff0000"><span>【分析】</span><span>由题意可知,共有成5人名,学生145名,又成人票:28元,学生票:16元,根据乘法的意义,购成人票需要5</span><span>×</span><span>28元,同理可知,学生票需要16</span><span>×</span><span>145元,共需要5</span><span>×</span><span>28</span><span>+</span><span>16</span><span>×</span><span>145元,算出后和2500元比较即可.</span><br><br><span>【解答】</span><span>解:5</span><span>×</span><span>28</span><span>+</span><span>16</span><span>×</span><span>145</span><br><br><span>=140</span><span>+</span><span>2320</span><br><br><span>=2460(元)</span><br><br><span>2460</span><span><</span><span>2500</span><br><br><span>所以带2500元钱买门票够;</span><br><br><span>答:带2500元钱买门票够.</span></font><br><br><span>34.(5分)一辆客车正在高速公路上行驶,看到路边的提示牌写着(如图):</span><br><br><span>(1)客车的速度是80千米/时,它还需要多长时间才能到达广州?</span><br><br><span>(2)如果货车的速度是70千米/时的速度,它再行驶6时能否到达云浮?</span><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/2018226231638.png?m=0.6453185552555025"><br><br><font color="#ff0000"><span>【分析】</span><span>(1)客车的速度、从此地到广州的距离已知,根据“时间=路程</span><span>÷</span><span>速度”即可解答.</span><br><br><span>(2)根据“路程=速度</span><span>×</span><span>时间”求出货车从此地到</span><span>去浮的距离,再与提示牌上的距离比较即可确定.</span><br><br><span>【解答】</span><span>解:(1)240</span><span>÷</span><span>80=3(小时)</span><br><br><span>答:它还需要3小时才能到达广州.</span><br><br><span>(2)70</span><span>×</span><span>6=420(千米)</span><br><br><span>420千米</span><span><</span><span>423米</span><br><br><span>答:它再行驶6时不能到达云浮.</span></font><br><br><span>35.(5分)同学们进行跳绳比赛,规定每人跳3分钟,小红一共跳了</span><span>多少个?</span><br><br><img src="//www.szxuexiao.com/uploadimages/2018/0226/2018226231720.png?m=0.03328223662175711"><br><br><font color="#ff0000"><span>【分析】</span><span>要求小红3分钟跳了多少个,应求出小红1分钟跳了多少个.由题意,小红每分钟比小明多跳8个,那么应求出小明每分钟跳的个数.小明3分钟跳了321个,1分钟跳了321</span><span>÷</span><span>3=107(个),则小红每分钟跳(321</span><span>÷</span><span>3</span><span>+</span><span>8)=115(个),3分钟跳了115</span><span>×</span><span>3,计算即可.</span><br><br><span>【解答】</span><span>解:(321</span><span>÷</span><span>3</span><span>+</span><span>8)</span><span>×</span><span>3</span><br><br><span>=(107</span><span>+</span><span>8)</span><span>×</span><span>3</span><br><br><span>=115</span><span>×</span><span>3</span><br><br><span>=345(个)</span><br><br><span>答:小红一共跳了345个.</span></font><br><br><span>36.(5分)小红到体育场看足球比赛.她的座位是19看台的21排32座,这是体育场的最后一个看台,也是最后一排的最后一个座位.如果每个看台的座位数是相同的.请问这个体育场一共有多少个座位?</span><br><br><font color="#ff0000"><span>【分析】</span><span>由小红的“座位是19看台的21排32座,这是体育场的最后一个看台”可知,这个体育场每个看台有(21</span><span>×</span><span>32)个坐位,再乘19就是这个体育场坐位的总个数.</span><br><br><span>【解答】</span><span>解:21</span><span>×</span><span>32</span><span>×</span><span>19</span><br><br><span>=672</span><span>×</span><span>19</span><br><br><span>=12768(个)</span><br><br><span>答:这个体育场一共有12768个座位.</span></font><br><br></div>