Question

a的平方-2ab+b的平方分之a的平方-3ab+2b的平方除以a的平方-ab分之a的平方-4b的平方

Answer 1

[(a²-3ab+2b²)/(a²-2ab+b²)]÷[(a²-4b²)/(a²-ab)]

=(a²-3ab+2b²)(a²-ab)/[(a²-2ab+b²)(a²-4b²)]

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

=a/(a+2b)