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x²-y²-(x+y)
=(x²-y²)-(x+y)
=(x+y)(x-y)-(x+y)
=(x+y)(x-y-1)
9-（5x-2y）²
=[3+(5x-2y)][3-(5x-2y)]
=(3+5x-2y)(3-5x+2y)
=(x²-y²)-(x+y)
=(x+y)(x-y)-(x+y)
=(x+y)(x-y-1)
9-（5x-2y）²
=[3+(5x-2y)][3-(5x-2y)]
=(3+5x-2y)(3-5x+2y)
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