高数f(x)=x/x-1,求f[f(x)]
人气:205 ℃ 时间:2020-05-09 22:27:13
解答
f[f(x)]
=f[x/(x-1)]
=[x/(x-1)]/[x/(x-1)-1]
上下乘x-1
f[f(x)]=x/[x-(x-1)]=x
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