(a²-b²)/ab-(ab-b²)/(ab-a²) 分式计算
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(a²-b²)/ab-(ab-b²)/(ab-a²) 分式计算
(a²-b²)/ab-(ab-b²)/(ab-a²) 分式计算
(a²-b²)/ab-(ab-b²)/(ab-a²) 分式计算
=(a²-b²)/ab-b(a-b)/a(b-a)
=a/b-b/a+b/a
=a/b