Question

(a的平方-3ab+2b的平方)/(a的平方-2ab+b的平方)/(a-2b)

Answer 1

(a²-3ab+2b²)/(a²-2ab+b²)/(a-2b)

=(a²-3ab+2b²)*(a-2b)/(a²-2ab+b²)

=(a-b)*(a-2b)*(a-2b)/(a-b)²

=(a-2b)²/(a-b)