设 1/x=X 则 x=1/X => x/(1-x))=(1/X)/[1-(1/X)]=(1/X)/[(X-1)/X]=1/(X-1)
所以,f(X)=1/(X -1) 即 f(x)=1/(x-1)
已知 f(1/x)=x/1-x 求 f(x) 要换元法求的
已知 f(1/x)=x/1-x 求 f(x) 要换元法求的
数学人气:937 ℃时间:2020-05-19 09:21:20
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