Re: [其他] 反函數的問題
※ 引述《wjx0305 (胖包子~)》之銘言:
: f(x)=(5x+3)^1/3
: 則f(x)的反函數
: f-1(x)=?
: 請指導計算過程,感謝:)
令 y = f(x) = (5x + 3)^(1/3)
則 y^3 = 5x + 3
=> 5x = y^3 - 3
y^3 - 3
=> x = ---------
5
-1 x^3 - 3
∴ f (x) = ----------
5
--
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