3(x-y)²+4(x²-y²)-4(x+y)²
=3（x-y)²+4(x-y)(x+y)-4(x+y)²
=[3(x-y)-2(x+y)][(x-y)+2(x+y)]
=(3x-3y-2x-2y)(x-y+2x+2y)
=(x-5y)(3x+y)
因式分解：3(x-y)^2+4(x^2-y^2)-4(x+y)^2
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