计算:a²-b²分之a-a+b分之1
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计算:a²-b²分之a-a+b分之1
计算:a²-b²分之a-a+b分之1
计算:a²-b²分之a-a+b分之1
a/(a²-b²)-1/(a-b)
=a/[(a+b)(a-b)]-(a+b)/[(a+b)(a-b)]
=(a-a-b)/[(a+b)(a-b)]
=-b/(a²-b²)