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因式分解(X2-1)(Y2-1)-4XY
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人气:363 ℃ 时间:2020-05-25 22:06:27
解答
=x²y²-x²-y²+1-4xy
=(x²y²-2xy+1)-(x²+2xy+y²)
=(xy-1)²-(x+y)²
=(xy-1+x+y)(xy-1-x-y)
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