9(a-b)²-6（b-a)+1 16(2x+y)²-9(x-2y)² m²(x-2)+m(2-x) 1-x²+2xy-y²

9(a-b)²-6（b-a)+1 16(2x+y)²-9(x-2y)² m²(x-2)+m(2-x) 1-x²+2xy-y²
9(a-b)²-6（b-a)+1 16(2x+y)²-9(x-2y)² m²(x-2)+m(2-x) 1-x²+2xy-y²

9(a-b)²-6（b-a)+1 16(2x+y)²-9(x-2y)² m²(x-2)+m(2-x) 1-x²+2xy-y²
您好：

9(a-b)²-6（b-a)+1
=[3(a-b)+1]²
=(3a-3b+1)²

16(2x+y)²-9(x-2y)²
=[4(2x+y)+3(x-2y)][4(2x+y)-3(x-2y)]
=(11x-2y)(5x+6y)

m²(x-2)+m(2-x)
=(m²-1)(x-2)
=(m+1)(m-1)(x-2)

1-x²+2xy-y²
=1-(x-y)²
=(1+x-y)(1-x+y)
不明白,可以追问
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