Question

（x-1分之x + x-1分之1）除以x^2-2x+1分之x+1 其中x=-2

Answer 1

答：
[x/(x-1)+1/(x-1)]÷[(x+1)/(x²-2x+1)]
=[(x+1)/(x-1)]÷[(x+1)/(x-1)²]
=[(x+1)/(x-1)]×[(x-1)²/(x+1)]
=x-1