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分解因式:2xy+9-x^2-y^2
人气:352 ℃ 时间:2020-05-15 17:03:59
解答
2xy+9-x^2-y^2
=9-x^2-y^2+2xy
=9-(x^2+y^2-2xy)
=9-(x-y)^2
=[3-(x-y)][3+(x-y)]
=(3-x+y)(3+x-y)
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