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原式=x²-y²-(x-y)
=(x+y)(x-y)-(x+y)
=(x-y-1)(x+y)
=(x+y)(x-y)-(x+y)
=(x-y-1)(x+y)
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x^2-x-y-y^2
=(x-1/2)^2 -(y+1/2)^2
=[(x-1/2)-(y+1/2)] . [(x-1/2)+(y+1/2)]
=(x-y -1) ( x+y)
=(x-1/2)^2 -(y+1/2)^2
=[(x-1/2)-(y+1/2)] . [(x-1/2)+(y+1/2)]
=(x-y -1) ( x+y)
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