设f(x)=1/x,则f[f(x)]=( ) (A)1/x (B)1/xˆ2 (C)x (D)xˆ2
人气:198 ℃ 时间:2019-10-19 17:55:00
解答
C
f(x)=t =1/x 则 f[f(x)]=f[t] =1/t=1/1/x=x
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