计算:﹙2a-b/a+b-b/a-b﹚÷a-2b/a-b.最好有计算过程.

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计算:﹙2a-b/a+b-b/a-b﹚÷a-2b/a-b.最好有计算过程.
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计算:﹙2a-b/a+b-b/a-b﹚÷a-2b/a-b.最好有计算过程.
计算:﹙2a-b/a+b-b/a-b﹚÷a-2b/a-b.最好有计算过程.

计算:﹙2a-b/a+b-b/a-b﹚÷a-2b/a-b.最好有计算过程.
原式=(2a²-3ab+b²-ab-b²)/(a+b)(a-b)×(a-b)/(a-2b)
=(2a²-4ab)/(a+b)(a-b)×(a-b)/(a-2b)
=2a(a-2b)/(a+b)(a-b)×(a-b)/(a-2b)
=2a/(a+b)

﹙2a-b/a+b-b/a-b﹚÷a-2b/a-b
=﹙2a+b-b-b/a-b/a﹚÷a-2b/a-b
=﹙2a-2b/a﹚÷a-2b/a-b
=2-2b/a²-2b/a-b
=2-b-2b/a-2b/a²