您好：9(a-b)²-6（b-a)+1=[3(a-b)+1]²=(3a-3b+1)²16(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) ...