f(x)=100^x-1=1000 (x-1)lf100=lg1000 (x-1)=3/2f(x)=100^x-1=1000 (x-1)lf100=lg1000 (x-1)=3/2 x=5/2 f^-1(1000)=5/2,我想知道lf是什么,怎么来的!怎么移动变为3/2,大神看14题
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