Question

(a+b分之a-b -a-b分之a+b)除以(1 - a平方-2ab+b平方分之a平方+b平方）

Answer 1

原式=(a²-2ab+b²-a²-2ab-b²)/(a+b)(a-b)÷(a²-2ab+b²-a²-b²)/(a²-2ab+b²)

=-4ab/(a+b)(a-b)×(a-b)²/(-2ab)

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

=(2a-2b)(a+b)