(x-y)²-4(x+y)²怎么化简?

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(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