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
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