小学六年级数学下学期思维训练题

<div style="text-align: center;"><span class="Apple-style-span" style="font-weight: bold; "><font class="Apple-style-span" color="#FF0000">小学六年级数学下学期思维训练</font></span></div><br><span style=" font-weight:bold; ">一、&nbsp;</span><span style=" font-weight:bold; ">填空</span><span style=" font-weight:bold; "></span><br><br><span>1.把圆柱体的侧面沿着它的高线展开可以得到一个(</span><span>&nbsp;&nbsp;&nbsp;</span><span>)形,它的长相当于圆柱体(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;),宽相当于圆柱体的(&nbsp;&nbsp;&nbsp;),所以圆柱的侧面积S=(&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;</span><span>&nbsp;)。</span><br><br><span>2.已知圆柱体的底面直径是6cm,高是5cm&nbsp;,它的侧面积是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;</span><span>&nbsp;&nbsp;&nbsp;)cm</span><span style=" vertical-align:super; ">2</span><span>,表面积是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)cm</span><span style=" vertical-align:super; ">2</span><span>.</span><br><br><span>3.一个圆柱体底面周长是6.28分米,高是3&nbsp;分米,它的侧面积是(&nbsp;&nbsp;&nbsp;&nbsp;)平方分米。</span><br><br><span>4.把3段半径为2cm的圆钢焊接成一个圆柱,表面积减少了(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)平方厘米。</span><br><br><span>5.一个圆木的侧面积是31.4分米,高是5分米,它的底面半径是(&nbsp;&nbsp;&nbsp;</span><span>&nbsp;</span><span>&nbsp;)分米。</span><br><br><span>6.一个圆柱体侧面展开是正方形,它的高是底面直径的(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)倍。</span><br><br><span>7.圆柱的底面直径20m,表面积942m</span><span style=" vertical-align:super; ">2</span><span>,高是(&nbsp;</span><span>&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;)m.。</span><br><br><span style=" font-weight:bold; ">二、&nbsp;</span><span style=" font-weight:bold; ">判断</span><span style=" font-weight:bold; "></span><br><br><span>1.一张长30厘米,宽10厘米的长方形纸板,围成一个圆柱形纸筒,它的侧面积是300平方厘米。--------------(&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;)</span><br><br><span>2.圆柱体的半径扩大3倍,高缩小</span><span>,它的表面积不变。------------(</span><span>&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)</span><br><br><span>3.将圆柱沿着底面直径平均切成两半,得到的半圆柱表面积是圆柱表面积的一半-(&nbsp;)</span><br><br><span style=" font-weight:bold; ">三、&nbsp;</span><span style=" font-weight:bold; ">选择</span><span style=" font-weight:bold; "></span><br><br><span>1.利用下面(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)组条件,就可以计算出圆柱体的表面积。</span><br><br><span>A.&nbsp;底面半径和高&nbsp;&nbsp;B.底面周长和侧面积C.&nbsp;侧面积和高&nbsp;&nbsp;&nbsp;&nbsp;D.底面积和侧面积</span><br><br><span>2.一个圆柱形药盒,竖直放在桌面上,底面直径4厘米,高是10厘米,纸盒占桌面的面积(&nbsp;&nbsp;&nbsp;&nbsp;)</span><br><br><span>A.&nbsp;125.6&nbsp;cm</span><span style=" vertical-align:super; ">2</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.150.72&nbsp;cm</span><span style=" vertical-align:super; ">2&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;C.12.56&nbsp;cm</span><span style=" vertical-align:super; ">2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;D.&nbsp;251.2&nbsp;cm</span><span style=" vertical-align:super; ">2</span><br><br><span>3.把一个棱长40cm的正方体,切割成一个最大的圆柱体,它的侧面积是(&nbsp;)cm</span><span style=" vertical-align:super; ">2</span><br><br><span>A.&nbsp;5024&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.2512&nbsp;&nbsp;&nbsp;C.15072&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.2504</span><span style=" vertical-align:super; "></span><br><br><span>4.圆柱体的表面积有(&nbsp;&nbsp;&nbsp;</span><span>&nbsp;</span><span>&nbsp;)个面组成。</span><br><br><span>A.6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.1</span><br><br><span style=" font-weight:bold; ">四、&nbsp;</span><span style=" font-weight:bold; ">应用</span><span style=" font-weight:bold; "></span><br><br><span>1.做一个无盖的圆柱形铁皮水桶,它的底面半径是4分米,高是50厘米,需要多少铁皮?(接口处不计)。</span><br><br><span>2.铸件厂原有一个铁皮烟囱,横截面的直径0.84米,高15米,现将烟囱加高到25米,还需要多少铁皮?</span><br><br><span>3.把3个完全相同的圆柱体焊接成一个长9分米的圆柱形,表面积减少50.24平方分米,求原来每个小圆柱形的表面积?</span><br><br><span>4.如图所示,将圆柱四等份,其中一份的表面积是多少?</span><br><br><img src="//www.szxuexiao.com/uploadimages/2013/0216/20132160150.png?m=0.7702494489494711"><br><br><span>&nbsp;5.一个高10厘米的圆柱体,如果将它的高减少2厘米,表面积就减少12.56平方厘米,求原来圆柱体的侧面积。</span><br><br><span>6.一节用铁卷成的烟囱,长3米,直径40厘米,焊接的地方是3厘米,制造这节烟囱至少用多少铁皮?</span><br><div><span><br></span></div>