(2/X²-1)-(1/X-1)的解是多少

题目

(2/X²-1)-(1/X-1)的解是多少
要过程
(2/X²-1)-(1/X-1)=1/3的解是多少

答案

2/(x^2-1)-1/(x-1)
=2/(x-1)(x+1)-(x+1)/(x-1)(x+1)
=2-x-1/(x-1)x+1)
=1-x/(x-1)(x+1)
=-1/(x+1) ㊣㊪