(u-2v\u+2v)-(2\u²-4v²)
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![(u-2v\u+2v)-(2\u²-4v²)](/uploads/image/z/10761166-46-6.jpg?t=%EF%BC%88u-2v%5Cu%2B2v%EF%BC%89-%EF%BC%882%5Cu%26%23178%3B-4v%26%23178%3B%EF%BC%89)
(u-2v\u+2v)-(2\u²-4v²)
(u-2v\u+2v)-(2\u²-4v²)
(u-2v\u+2v)-(2\u²-4v²)
u²-4v²=(u+2v)(u-2v)
最简公分母是(u+2v)(u-2v)
所以原式=(u-2v)²/(u+2v)(u-2v)-2/(u+2v)(u-2v)
=[(u-2v)²-2]/(u+2v)(u-2v)
=(u²-4uv+4v²-2)/(u²-4v²)
不会有三次的