解:(2a+2)/(a-1)÷(a+1)+(a²-1)/(a²-2a+1)=2(a+1)/(a-1)÷(a+1)+(a+1)(a-1)/(a-1)²=2/(a-1)+(a+1)/(a-1)=(a+3)/(a-1)化简的结果就是上面的a=1不可以哦,因为此时分母为0是无意义的