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因式分解9 - x² - y² + 2xy
RT
人气:392 ℃ 时间:2020-05-11 09:19:20
解答
9-x² - y² + 2xy
=9-(x² +y² - 2xy)
=3²-(x-y)²
=[3-(x-y)]×[3+(x-y)]
=(3-x+y)(3+x-y)
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