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问题: 高中数学

Y=X+1\1-X的值域是?

解答:

Y=(X+1)/(1-X)
Y-YX=X+1
X(1+Y)=Y-1
X=(Y-1)/(1+Y) ==》Y≠-1


Y=(1-X)/(X+1)
XY+Y=1-X
X(Y+1)=1-Y ==》X=(Y-1)/(1+Y) ==》Y≠-1