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分解因式9-x^2+2xy-y^2
人气:132 ℃ 时间:2020-05-08 11:03:56
解答
9-x^2+2xy-y^2
=9-(x-y)^2
=[3-(x-y)][3+(x-y)]
=(3-x+y)(3+x-y)
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