化简a²/a-1 +a+1

题目

化简a²/a-1 +a+1
化简a²/a-1 +a+1
/为分数线

答案

原式=[a²-(a+1)(a-1)]/(a-1)
=[a²-(a²-1)]/(a-1)
=(a²-a²+1)/(a-1)
=1/(a-1)