小学六年级下册数学创维新课堂测试卷上的第68页的第3和第5题的答案?
推荐回答（5个）
求半径：r=16.56/(3.14+1)/2 =2 因为16.56是由一个圆直径和一个底面周长组成。
高是两个直径组成：h=2*4=8
接着可以用圆柱体表面积公式求，也可以用长方形面积减去多余部分的面积求。
S=3.14*2*2*2+3.14*2*2*8=125.6
16.56/(3.14+1)/2 =2
2*4=8
3.14*2*2*2+3.14*2*2*8=125.6
设长方形的宽为X，圆筒半径r=X/4,
2 圆的周长=16.5-圆的直径，所以等式为2*圆周率*X/4=16.5-X/2,
3,算出X=4，即宽为4，剩下自己算吧，我都好多年没做过了，挺新鲜的
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