(x-y)^2-9(x+y)^2
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原式=(x-y+3x+3y)(x-y-3x-3y)
=(4x+2y)(-2x-4y)
=-4(2x+y)(x+2y)
=(4x+2y)(-2x-4y)
=-4(2x+y)(x+2y)
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(x-y)^2-9(x+y)^2
=(x-y)^2-(3(x+y))^2
=(x-y+3(x+y))(x-y-3(x+y))
=(x-y+3x+3y)(x-y-3x-3y)
=(4x+2y)(-2x-4y)
=-4(2x+y)(x+2y)
=(x-y)^2-(3(x+y))^2
=(x-y+3(x+y))(x-y-3(x+y))
=(x-y+3x+3y)(x-y-3x-3y)
=(4x+2y)(-2x-4y)
=-4(2x+y)(x+2y)
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(x-y)^2-9(x+y)^2
=(x-y-3x-3y)(x-y+3x+3y)
=-8(x+y)(2x+y)
=(x-y-3x-3y)(x-y+3x+3y)
=-8(x+y)(2x+y)
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