-3(x-y)(x-y)+3(x-y)
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-3(x-y)(x-y)+3(x-y)-3(x-y)(x-y)+3(x-y)-3(x-y)(x-y)+3(x-y)-3(x-y)(x-y)+3(x-y)=-3(x²-2xy+y²)
-3(x-y)(x-y)+3(x-y)
-3(x-y)(x-y)+3(x-y)
-3(x-y)(x-y)+3(x-y)
-3(x-y)(x-y)+3(x-y)
=-3(x²-2xy+y²)+3x-3y
=-3x²+6xy-3y²+3x-3y
祝学习进步,望采纳.
不懂得欢迎追问.
答案是-3x2+6xy-3y2+3x-3y
-3(x-y)【(x-y)+1】
-3(x-y)(x-y)+3(x-y)
=-3(x-y)²+3(x-y)
就跟一楼的一样了
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