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$0 = \pi \exponential{(\exponential{r}{2} + \fraction{900}{\exponential{\pi}{2} \exponential{r}{4}})}{\fraction{1}{2}} + \fraction{1}{2} \pi r (\exponential{r}{2} + \fraction{900}{\exponential{\pi}{2} r 4}) $
求解 r_4 的值
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