2a+2/a-1 ÷(a+1)- a²-1 /a²-2a+1=2（a+1）/(a-1)×1/(a+1)-(a+1)(a-1)/(a-1)²=2/(a-1)-(a+1)/(a-1)=(1-a)/(a-1)=-1;很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明白可以追问,...