[代數] 基本解根？

[wrbyonex (間波)]

q (Q - q a^3 (2 y^2 - a^2)/(y (y^2 - a^2)^2))/y^2 = 0

If Q/q >> 1, y -> a(1+1/2sqrt(q/Q))

I don't konw how to solve...

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