<div style="text-align: center;"><strong><font color="#ff0000">小学六年级数学上册2.3倒数的认识</font></strong></div><br><div style="text-align: center;">基础作业 不夯实基础，难建成高楼。</div><br><span>1. 直接写出得数。</span><br><br><span>4×</span><ruby>4<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span>＝ </span><ruby>15<rp>(</rp><rt>8</rt><rp>)</rp></ruby><span>×</span><ruby>8<rp>(</rp><rt>15</rt><rp>)</rp></ruby><span>＝ 0×</span><ruby>5<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span>＝</span><br><br><ruby>5<rp>(</rp><rt>4</rt><rp>)</rp></ruby><span>×</span><ruby>4<rp>(</rp><rt>5</rt><rp>)</rp></ruby><span>＝ </span><span> </span><ruby>14<rp>(</rp><rt>17</rt><rp>)</rp></ruby><span>×</span><ruby>17<rp>(</rp><rt>14</rt><rp>)</rp></ruby><span>＝</span><br><br><span>2. 写出下列各数的倒数。</span><br><br><ruby>4<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span> 0.7 1.25 1</span><ruby>3<rp>(</rp><rt>2</rt><rp>)</rp></ruby><span> 12 </span><br><br><span>3. 判断。</span><br><br><span>(1)真分数的倒数一定是假分数。</span><span> </span><span>( )</span><br><br><span>(2)1的倒数是1,0的倒数是0。</span><span> </span><span>( )</span><br><br><span>(3)因为</span><ruby>3<rp>(</rp><rt>2</rt><rp>)</rp></ruby><span>×</span><ruby>2<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span>＝1，所以</span><ruby>3<rp>(</rp><rt>2</rt><rp>)</rp></ruby><span>是倒数。</span><span> </span><span>( )</span><br><br><span>(4)因为6的倒数是</span><ruby>6<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span>，所以</span><span style=" font-style:italic; ">a</span><span>的倒数是</span><ruby>a<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span>。</span><span> </span><span>( )</span><br><br><span>4. 选择。</span><br><br><span>(1)( )的两个数，互为倒数。</span><br><br><span>A. 和是1 B. 差是1</span><br><br><span>C. 乘积是1 </span><span> </span><span>D. 商是1</span><br><br><span>(2)因为</span><ruby>8<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span>×</span><ruby>3<rp>(</rp><rt>8</rt><rp>)</rp></ruby><span>＝1，所以( )。</span><br><br><span>A. </span><ruby>8<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span>是倒数 </span><span> </span><span>B. </span><ruby>3<rp>(</rp><rt>8</rt><rp>)</rp></ruby><span>是倒数</span><br><br><span>C. </span><ruby>8<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span>和</span><ruby>3<rp>(</rp><rt>8</rt><rp>)</rp></ruby><span>都是倒数 </span><span> </span><span>D. </span><ruby>8<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span>和</span><ruby>3<rp>(</rp><rt>8</rt><rp>)</rp></ruby><span>互为倒数</span><br><br><span>(3)一个数的倒数比它本身小，那么这个数( )。</span><br><br><span>A. 大于1 </span><span> </span><span>B. 等于1 </span><span> </span><span>C. 小于1</span><br><br><span>(4)既不是质数，又不是合数的整数的倒数是( )。</span><br><br><span>A. 0 </span><span> </span><span>B. 1 </span><span> </span><span>C. </span><ruby>2<rp>(</rp><rt>1</rt><rp>)</rp></ruby><br><br><br><span><strong>综合提升 重点难点，一网打尽</strong></span><br><br><span>5. 填空。</span><br><br><span>(1)</span><ruby>9<rp>(</rp><rt>7</rt><rp>)</rp></ruby><span>的倒数是( )，7的倒数是( )，( )的倒数是它本身。</span><br><br><span>(2)</span><ruby>5<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span>×( )＝</span><ruby>8<rp>(</rp><rt>7</rt><rp>)</rp></ruby><span>×( )＝15×( )＝0.5×</span><br><br><span>( )＝ 1</span><br><br><span>(3)</span><span style=" font-style:italic; ">a</span><span>，</span><span style=" font-style:italic; ">b</span><span>，</span><span style=" font-style:italic; ">c</span><span>是三个大于0的自然数，</span><span style=" font-style:italic; ">a</span><span>的</span><ruby>3<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span>是</span><span style=" font-style:italic; ">b</span><span>，</span><span style=" font-style:italic; ">b</span><span>的</span><ruby>3<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span>是</span><span style=" font-style:italic; ">c</span><span>，如果</span><span style=" font-style:italic; ">a</span><span>是9，那么</span><span style=" font-style:italic; ">b</span><span>＋</span><span style=" font-style:italic; ">c</span><span>＝( )。</span><br><br><span>(4)如果</span><span style=" font-style:italic; ">a</span><span>×</span><ruby>7<rp>(</rp><rt>6</rt><rp>)</rp></ruby><span>＝</span><span style=" font-style:italic; ">b</span><span>×</span><ruby>5<rp>(</rp><rt>6</rt><rp>)</rp></ruby><span>＝</span><ruby>5<rp>(</rp><rt>5</rt><rp>)</rp></ruby><span>×</span><span style=" font-style:italic; ">c</span><span>，</span><span>其中</span><span style=" font-style:italic; ">a</span><span>，</span><span style=" font-style:italic; ">b</span><span>，</span><span style=" font-style:italic; ">c</span><span>都是自然数，且都不等于0，请把</span><span style=" font-style:italic; ">a</span><span>，</span><span style=" font-style:italic; ">b</span><span>，</span><span style=" font-style:italic; ">c</span><span>三个数按从小到大的顺序排列起来是( )。</span><br><br><span>6. 列式计算。</span><br><br><span>(1)</span><ruby>5<rp>(</rp><rt>4</rt><rp>)</rp></ruby><span>与它的倒数的</span><ruby>5<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span>相乘是多少？</span><br><br><span>(2)4的</span><ruby>16<rp>(</rp><rt>13</rt><rp>)</rp></ruby><span>加上</span><ruby>4<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span>的倒数的和是多少？</span><br><br><span>(3)一个数的倒数是2.4，另一个数是1</span><ruby>5<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span>，这两个数的和是多少？</span><br><br><br><span><strong>拓展探究 举一反三，应用创新，方能一显身手！</strong></span><br><br><span>7. 分数单位是</span><ruby>9<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span>的最大真分数的倒数减去最小两位数的倒数，差是多少？</span><br><br><span>8. 五个连续奇数和的倒数是</span><ruby>45<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span>，这五个奇数中最大的奇数是多少？</span><br><br><br><span><strong>算 术 好 学</strong></span><br><br><span>妈妈：“儿子，上学半年啦，你觉得语文和算术哪门课好学？”</span><br><br><span>儿子：“当然是算术。”</span><br><br><span>妈妈：“为啥？”</span><br><br><span>儿子：“语文课生字多，算术只有十个数字。”</span><br><br><br><br><div style="text-align: center;"><strong><font color="#38761d">小学六年级数学上册2.3倒数的认识练习题答案</font></strong></div><br><span>1. 1 1 0 1 1</span><br><br><span>2. </span><ruby>3<rp>(</rp><rt>4</rt><rp>)</rp></ruby><span> </span><ruby>7<rp>(</rp><rt>10</rt><rp>)</rp></ruby><span> </span><ruby>5<rp>(</rp><rt>4</rt><rp>)</rp></ruby><span> </span><ruby>5<rp>(</rp><rt>3</rt><rp>)</rp></ruby><span> </span><ruby>12<rp>(</rp><rt>1</rt><rp>)</rp></ruby><br><br><span>3. (1) (2) (3) (4)</span><br><br><span>4. (1)C (2)D (3)A (4)B</span><br><br><span>5. (1)</span><ruby>7<rp>(</rp><rt>9</rt><rp>)</rp></ruby><span> </span><ruby>7<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span> 1 (2)5 </span><ruby>7<rp>(</rp><rt>8</rt><rp>)</rp></ruby><span> </span><ruby>15<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span> 2 </span><br><br><span>(3)4 (4)</span><span style=" font-style:italic; ">b＜c＜a</span><br><br><span>6. (1)</span><ruby>5<rp>(</rp><rt>1</rt><rp>)</rp></ruby><span> (2)</span><ruby>12<rp>(</rp><rt>55</rt><rp>)</rp></ruby><span> (3)</span><ruby>60<rp>(</rp><rt>121</rt><rp>)</rp></ruby><br><br><span>7. </span><ruby>40<rp>(</rp><rt>41</rt><rp>)</rp></ruby><span> 8. 13</span><br><br>
六年级上