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64x3.14

3.14x6.25x64 =3.14x(6.25x64) =3.14x400 =1256

你好: 3.14×64×4×1/3 =267.95 愿对你有帮助!

1. V圆柱=S圆柱h圆柱=3.14x4^2x4=64x3.14 V方钢=S方钢h方钢=4x4xh方钢=16h方钢 V圆柱=V方钢 -->64x3.14=16h方钢 --> h方钢=4x3.14...

7.64x2.5-3.14x2.5=(7.64-3.14)x2.5=4.5*2.5=(4+0.5)*2.5=10+1.25=11.25

8x8x3.14x4=64x3.14x4 设截取Acm Ax4x4x3.14=64x3.14x4 A=16 答:至少截取16cm

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