Question

化简(a的平方+3)/(a的平方-1)-(a+1)/(a-1)-1等于

Answer 1

(a²+3)/(a+1)(a-1)-(a+1)²/(a+1)(a-1) -1

=(a²+3-a²-2a-1)/(a+1)(a-1)-1

=(2-2a)/(a+1)(a-1)-1

=-2/(a+1)-1

=(-2-a-1)/(a+1)

=-(3+a)/(a+1)