问题描述:
1.x(x-y)+y(y-x)2.9(a-b)^2-16(a+b)^23.25(x-y)^2+10(y-x)+1
问题描述:
1.x(x-y)+y(y-x)2.9(a-b)^2-16(a+b)^23.25(x-y)^2+10(y-x)+1
19(a-b)^2-16(a+b)^2 =-7a^2-50ab-7b^2 =-(7a+b)(a+7b) 23x^3-12x^2y+12xy^2 =3x(x^2-4xy+4y^2) =3x(x-2y)^2 325(x-y)^2+10(y-x)+1 =25(x-y)^2-10(x-y)+1 =[5(x-y)-1]^2 =(5x-5y-1)^2