先化简,再求值[a²/a²-b²-a²b/a²-b²*(a/
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先化简,再求值[a²/a²-b²-a²b/a²-b²*(a/ab+b²-b/a²+ab)]
![先化简,再求值[a²/a²-b²-a²b/a²-b²*(a/](/uploads/image/z/6714986-50-6.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%5Ba%26%23178%3B%2Fa%26%23178%3B-b%26%23178%3B-a%26%23178%3Bb%2Fa%26%23178%3B-b%26%23178%3B%2A%28a%2F)
[a²/a²-b²-a²b/a²-b²*(a/ab+b²-b/a²+ab)]
={a²(/a²-b²)-a²b/(a²-b²)*(a²-b²)/[ab(a+b)]}
={a²/(a²-b²)-a/[(a+b)]}
=[a²-a(a-b)]/[(a+b)(a-b)]
=b/[a+b)(a-b)]
={a²(/a²-b²)-a²b/(a²-b²)*(a²-b²)/[ab(a+b)]}
={a²/(a²-b²)-a/[(a+b)]}
=[a²-a(a-b)]/[(a+b)(a-b)]
=b/[a+b)(a-b)]
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