作业帮(x-y)²-4(x+y)²怎么化简?
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 19:28:57
(x-y)²-4(x+y)²怎么化简?
(x-y)²-4(x+y)²怎么化简?
(x-y)²-4(x+y)²怎么化简?
(x-y)²-4(x+y)²
=[(x-y)+2(x+y)][(x-y)-2(x+y)]
=(x-y+2x+2y)(x-y-2x-2y)
=(3x+y)(-x-3y)
=-3x^2-10xy-3y^2
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来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 19:28:57
(x-y)²-4(x+y)²怎么化简?
(x-y)²-4(x+y)²怎么化简?
(x-y)²-4(x+y)²怎么化简?
(x-y)²-4(x+y)²
=[(x-y)+2(x+y)][(x-y)-2(x+y)]
=(x-y+2x+2y)(x-y-2x-2y)
=(3x+y)(-x-3y)
=-3x^2-10xy-3y^2