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設底面半徑是r,高是h,那麼,側面積:3.14*2*r*h=100,則r*h=100/(3.14*2)體積:3.14*r*r*h=250也就是:3.14*r*100/(3.14*2)=250r*50=250所以,r=250/50=5直接的算術法就是:250÷[3.14×100÷(3.14×2)]=250÷50=5…
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