a-b分之a+b-a分之b乘以a-b分之ab

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a-b分之a+b-a分之b乘以a-b分之aba-b分之a+b-a分之b乘以a-b分之aba-b分之a+b-a分之b乘以a-b分之ab(a+b)/(a-b)-b/a*ab/(a-b)?=(a+b)/(a

a-b分之a+b-a分之b乘以a-b分之ab
a-b分之a+b-a分之b乘以a-b分之ab

a-b分之a+b-a分之b乘以a-b分之ab
(a+b)/(a-b)-b/a*ab/(a-b) ?
=(a+b)/(a-b)-b²/(a-b)
=(a+b-b²)/(a-b)