计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b)

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计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b)计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b)计算·[(2a+-b)/(a+b)-b/(a

计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b)
计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b)

计算·[(2a+-b)/(a+b)-b/(a+b)]/(a-2b)/(a+b)
2a-b/a+b-b/a-b)除以a-2b/a+b
=[(2a-b)(a-b)-b(a+b)]/(a+b)(a-b)x(a+b)/(a-2b)
=(2a²-3ab+b²-ab-b²)/(a-b)(a-2b)
=2a(a-2b)/(a-b)(a-2b)
=2a/(a-b)