(x-y-1)(-x+y-1)怎么解 大家帮帮忙
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(x-y-1)(-x+y-1)
=(x-y-1)[-(x-y)-1]
=1-(x-y)^2
=1-(x^2-2xy+y^2)
=1-x^2+2xy-y^2
=(x-y-1)[-(x-y)-1]
=1-(x-y)^2
=1-(x^2-2xy+y^2)
=1-x^2+2xy-y^2
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(x-y-1)(-x+y-1)
=-(x-y-1)(x-y+1)
=-(x-y)^2+1
=-x^2+2xy-y^2+1
=-(x-y-1)(x-y+1)
=-(x-y)^2+1
=-x^2+2xy-y^2+1
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