反函数的自变量值是原函数的函数值,即f(x)=9
f(x)=4^x-2×2^x+1=9
x=2
原函数的自变量值是反函数的函数值,所以f^-1(9)=2
若f(x)=4^x-2×2^x+1(x>0)的反函数为f^-1(x),则f^-1(9)=?
若f(x)=4^x-2×2^x+1(x>0)的反函数为f^-1(x),则f^-1(9)=?
数学人气：723 ℃时间：2019-10-26 21:04:18
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