最好发图比较容易看!

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最好发图比较容易看!
 

已知,V = (4π/3)R³ ,
可得:R = [(3V)/(4π)]^(1/3) = [(3*6280)/(4*3.14)]^(1/3) = 1500^(1/3) = 5*12^(1/3) ≈ 11.45 cm 。