设半径为Ra,Rb,Rcpi(Rb^2 + Rc^2) = 4/5 pi Ra^2阴影AB = 1/5 pi Rb^2阴影AC = 1/3 pi Rc^2阴影AB+AC = 1/6 pi Ra^2Ra^2 / Rb^2 = 4/3Ra^2 / Rc^2 = 20面积比 = 20:15:1 ^符号是乘吗?

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