(u-2v\u+2v)-(2\u²-4v²)
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(u-2v\u+2v)-(2\u²-4v²)(u-2v\u+2v)-(2\u²-4v²)(u-2v\u+2v)-(2\u²-4v²)u
(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