a+b分之a减a-b分之b

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a+b分之a减a-b分之b

a+b分之a减a-b分之b
=[a(a-b)-b(a+b)]/[(a+b)(a-b)]
=(a²-ab-ba-b²)/(a²-b²)
=(a²-2ab-b²)/(a²-b²)

a+b分之a减a-b分之b
=[a(a-b)-b(a+b)]/[(a+b)(a-b)]
=(a²-ab-ba-b²)/(a²-b²)
=(a²-2ab-b²)/(a²-b²)

a+b分之a减a-b分之b
=[a(a-b)-b(a+b)]/[(a+b)(a-b)]
=(a²-ab-ba-b²)/(a²-b²)
=(a²-2ab-b²)/(a²-b²)