4: 表面积
3.14x1x2+(3.14x1x2)x(3.14x1x2)
= 3.14x1x2+(3.14x1x2)x(3.14x1x2)
=6.28+39.4384
=45.7184(平方分米)
体积
3.14x1x(3.14x1x2)
=3.14x1x(3.14x1x2)
=19.7192(立方分米)
5: 12.56÷3.14÷2=2(米)
3.14×2x1.2x1/3x750x75%
=3.14×4x1.2x1/3x750x75%
=2826(千克)
6: ⑴94.2÷3.14÷2=15(厘米)
3.14x15
=3.14x225
=706.5(平方厘米)
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