设f(x2+4)=x4+5x2+6,求f(x).
因为 f(x2+4)=x4+5x2+6 =(x2+2)(x2+3) =(x2+4-2)(x2+4-1), 故设x2+4=y,则 f(y)=(y-2)(y-1) 所以 f(x)=(x-2)(x-1)
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