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分解因式用十字相乘(x-y)的平方+3(x的平方-y的平方)-4(x+y)的平方
人气:430 ℃ 时间:2020-05-21 11:32:31
解答
(x-y)^2+3(x^2-y^2)-4(x+y)^2
=(x-y)^2+3(x+y)(x-y)-4(x+y)^2
=[(x-y)+4(x+y)][(x-y)-(x+y)]
=-2y(5x+3y)
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