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求一函數的反函數,也是解方程,求出x=多少y? 具體解法如下: (x-1)^2=y+4. (x-1)=±√(y+4) x=1±√(y+4)(y≥-4) 習慣上,用x表示引數,y表示函數, 故,原函數的反函數為:y=1±√(x+4).(x≥-4).
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