Question

（a+b分之2a-b-a-b分之b）除以a+b分之a-2b

Answer 1

原式=[(2a-b)/(a+b)-b/(a-b)]/[(a-2b)/(a+b)]对吗?

=（2a^2-3ab+b^2-ab-b^2)/[(a+b)(a-b)]*(a+b)/(a-2b)

=2a(a-2b)/[(a-b)(a-2b)]

=2a/(a-b)