分解因式ab(x²-y²)-(a²-b²)(xy+1)-(a²+b²)(x+y)
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ab(x²-y²)-(a²-b²)(xy+1)-(a²+b²)(x+y)
=ab(x^2-y^2)-a^2(xy+1)+b^2(xy+1)-a^2(x+y)-b^2(x+y)
=ab(x^2-y^2)-a^2(xy+1+x+y)+b^2(xy+1-x-y)
=b^2(xy+1-x-y)+ab(x^2-y^2)-a^2(xy+1+x+y)
=(x-1)(y-1)b^2+(x^2-y^2)ab-(x+1)(y+1)a^2
=[ (x-1)b - (y+1)a ][ (y-1)b + (x+1)a ]
= (bx-b -ay-a) (by-b +ax+a)
=ab(x^2-y^2)-a^2(xy+1)+b^2(xy+1)-a^2(x+y)-b^2(x+y)
=ab(x^2-y^2)-a^2(xy+1+x+y)+b^2(xy+1-x-y)
=b^2(xy+1-x-y)+ab(x^2-y^2)-a^2(xy+1+x+y)
=(x-1)(y-1)b^2+(x^2-y^2)ab-(x+1)(y+1)a^2
=[ (x-1)b - (y+1)a ][ (y-1)b + (x+1)a ]
= (bx-b -ay-a) (by-b +ax+a)
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