因式分解:3(x+y)(y-x)-(x-y)^2
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3(x+y)(y-x)-(x-y)^2
=3(y^2-x^2)-(x^2+y^2-2xy)
=3y^2-3x^2-x^2-y^2+2xy
=2y^2-4x^2+2xy
=2(y^2-2x^2+xy)
=2(y^2+xy+1/4x^2-1/4^2-2x^2)
=2[(y+1/2x)^2-9/4x^2]
=2(y+1/2x+3/2x)(y+1/2x-3/2x)
=2(y+2x)(y-x)
=3(y^2-x^2)-(x^2+y^2-2xy)
=3y^2-3x^2-x^2-y^2+2xy
=2y^2-4x^2+2xy
=2(y^2-2x^2+xy)
=2(y^2+xy+1/4x^2-1/4^2-2x^2)
=2[(y+1/2x)^2-9/4x^2]
=2(y+1/2x+3/2x)(y+1/2x-3/2x)
=2(y+2x)(y-x)
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3(x+y)(y-x)-(x-y)^2
=3(x+y)(y-x)-(y-x)^2
=(3x+3y-y+x)(y-x)
=(4x+2y)(y-x)
=2(2x+y)(y-x)
=3(x+y)(y-x)-(y-x)^2
=(3x+3y-y+x)(y-x)
=(4x+2y)(y-x)
=2(2x+y)(y-x)
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3(x+y)(y-x)-(x-y)^2
=(x-y)[-3(x+y)-(x-y)]
=(x-y)(-3x-3y-x+y)
=(x-y)(-4x-2y)
=-2(x-y)(2x+y)
=(x-y)[-3(x+y)-(x-y)]
=(x-y)(-3x-3y-x+y)
=(x-y)(-4x-2y)
=-2(x-y)(2x+y)
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