若f(x)=2x-9/X,则方程f(9x)=x的根是 ( ) A.1/2 B.-1/2 C.1 D.-1若f(x)=2x-9/X,则方程f(9x)=x的根是 ( )A.1/2 B.-1/2C.1 D.-1
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![若f(x)=2x-9/X,则方程f(9x)=x的根是 ( ) A.1/2 B.-1/2 C.1 D.-1若f(x)=2x-9/X,则方程f(9x)=x的根是 ( )A.1/2 B.-1/2C.1 D.-1](/uploads/image/z/3768913-1-3.jpg?t=%E8%8B%A5f%EF%BC%88x%EF%BC%89%3D2x-9%2FX%2C%E5%88%99%E6%96%B9%E7%A8%8Bf%EF%BC%889x%EF%BC%89%3Dx%E7%9A%84%E6%A0%B9%E6%98%AF+%EF%BC%88+%EF%BC%89+A.1%2F2+B.-1%2F2+C.1+D.-1%E8%8B%A5f%EF%BC%88x%EF%BC%89%3D2x-9%2FX%2C%E5%88%99%E6%96%B9%E7%A8%8Bf%EF%BC%889x%EF%BC%89%3Dx%E7%9A%84%E6%A0%B9%E6%98%AF+%EF%BC%88+%EF%BC%89A.1%2F2+B.-1%2F2C.1+D.-1)
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若f(x)=2x-9/X,则方程f(9x)=x的根是 ( ) A.1/2 B.-1/2 C.1 D.-1若f(x)=2x-9/X,则方程f(9x)=x的根是 ( )A.1/2 B.-1/2C.1 D.-1
若f(x)=2x-9/X,则方程f(9x)=x的根是 ( ) A.1/2 B.-1/2 C.1 D.-1
若f(x)=2x-9/X,则方程f(9x)=x的根是 ( )
A.1/2 B.-1/2
C.1 D.-1
若f(x)=2x-9/X,则方程f(9x)=x的根是 ( ) A.1/2 B.-1/2 C.1 D.-1若f(x)=2x-9/X,则方程f(9x)=x的根是 ( )A.1/2 B.-1/2C.1 D.-1
f(9x)=x
18x-9/9x=x
2x-1=x^2
(x--1)^2=0
x=1
C
无解啊!