x²-2xy+y²-9
=(x-y)²-3²
=[(x-y)+3][(x-y)-3]
=(x-y+3)(x-y-3)
(x+y)²-4(x+y)
=(x+y)[(x+y)-4]
=(x+y)(x+y-4)
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分解因式 x²-2xy+y²-9 （x+y）²-4（x+y）
x²-2xy+y²-9
=(x-y)²-3²
=[(x-y)+3][(x-y)-3]
=(x-y+3)(x-y-3)
(x+y)²-4(x+y)
=(x+y)[(x+y)-4]
=(x+y)(x+y-4)
很高兴为您解答,【the 1900】团队为您答题.
请点击下面的【选为满意回答】按钮.