Question

（a-1分之a+1 + a的平方-2a+1分之1) 除以 a-1分之a

Answer 1

（a-1分之a+1 + a的平方-2a+1分之1) 除以 a-1分之a

=[(a+1)/(a-1)+1/(a-1)²]×(a-1)/a

=[(a+1)(a-1)/(a-1)²+1/(a-1)²]×(a-1)/a

=a²/(a-1)²×(a-1)/a

=a/(a-1)