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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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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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?
设半径为Ra,Rb,Rc
pi(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^2
Ra^2 / Rb^2 = 4/3
Ra^2 / Rc^2 = 20
面积比 = 20：15：1 ^符号是乘吗?

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?
是乘方运算.