3.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=1296
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![3.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=1296](/uploads/image/z/6672991-31-1.jpg?t=3.14%2Ar%5E2%2Ah%3D3.14%2A%28a%2F2%29%5E2%2Aa%3D3.14%2Aa%5E3%2F4%3D1296)
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3.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=1296
3.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=1296
3.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=1296
乘方
r^2=r²