设圆直径d。d+πd=8.28 d=2S=8.28*2=16.56V=2*3.14=6.28
8.28÷(1+3.14)=23.14×2²=12.562²×3.14×(8.28-4)=12.56×4.28=53.756我们家作是这个,不过不一定对,听天由命吧
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不会