体积=5*8*9.42=376.8
半径=37.68/2π=6
设高为x
1/3*3.14*6²*x=376.8
x=10
体积=1/3*πr²h=1/3*3.14*1*4.5=4.71
设铺x米
5*0.02*x=4.71
x=47.1米
1.解;设可铺X米
1.
设高为X
37.68/3.14/2=6(cm)
6x6x3.14Xx1/3=5x8x9.42
12x3.14X=120x3.14
12x=120
x=10
2.
设长X米
5x0.02X=1x1x3.14x4.5x1/3
0.1x=4.71
x=47.1
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