Question

函数f(x)= x+1/x-1(x不等于正负1）,则f(-x)等于多少?

Answer 1

f(x)=x+1/x-1 则f(-x)=-x-1/x-1

f(x)=x+1/(x-1).则f(-x)=-x-1/(1+x)

f(x)=(x+1)/(x-1),则f(-x)=(x-1)/(x+1)