(x-2)³-(y-2)³-(x-y)³ 因式分解
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(x-2)³-(y-2)³-(x-y)³
=[(x-2)³-(y-2)³]-(x-y)³ [把x-2和y-2分别看成一个整体,再用公式a³-b³=(a-b)(a²+ab+b²)]
=(x-2-y+2)[(x-2)²+(x-2)(y-2)+(y-2)²]-(x-y)³
=(x-y)(x²-6x+y²-6y+12)-(x-y)³ (提取公因式x-y)
=(x-y)(x²-6x+xy+y²-6y+12-x²+2xy-y²)
=(x-y)(12+3xy-6x-逗做6y)
=(x-y)[3x(y-山扒衡2)-6(y-2)](分组提取公因此配式)
=(x-y)(3x-6)(y-2)
=3(x-y)(x-2)(y-2)
不懂的还可以问!满意请及时采纳! O(∩_∩)O
=[(x-2)³-(y-2)³]-(x-y)³ [把x-2和y-2分别看成一个整体,再用公式a³-b³=(a-b)(a²+ab+b²)]
=(x-2-y+2)[(x-2)²+(x-2)(y-2)+(y-2)²]-(x-y)³
=(x-y)(x²-6x+y²-6y+12)-(x-y)³ (提取公因式x-y)
=(x-y)(x²-6x+xy+y²-6y+12-x²+2xy-y²)
=(x-y)(12+3xy-6x-逗做6y)
=(x-y)[3x(y-山扒衡2)-6(y-2)](分组提取公因此配式)
=(x-y)(3x-6)(y-2)
=3(x-y)(x-2)(y-2)
不懂的还可以问!满意请及时采纳! O(∩_∩)O
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