Question

a分之a²-ab除以(b分之a-a分之b)

Answer 1

a分之a²-ab除以(b分之a-a分之b)

[(a²-ab)/a]/(a/b-b/a)

=[a(a-b)/a]/(a²/ab-b²/ab)

=(a-b)/[(a²-b²)/ab]

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

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

=ab/(a+b)