化简(-x)(x^2-2xy-y^2)-y(xy+2x^2-y^2) ,(9a^2-6ab+b^2)÷(3a-b)-2(

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/09 09:49:08

化简(-x)(x^2-2xy-y^2)-y(xy+2x^2-y^2) ,(9a^2-6ab+b^2)÷(3a-b)-2(a+b)^2,

(-x)(x^2-2xy-y^2)-y(xy+2x^2-y^2)
=-x^3+2x^2y+xy^2-xy^2-2x^2y+y^3
=-x^3+y^3
(9a^2-6ab+b^2)÷(3a-b)-2(a+b)^2,
=(3a-b)^2÷(3a-b)-2(a+b)^2
=3a-b-2a^2-4ab-2b^2

3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy 已知：A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B x²（x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) （x-A）*(B-y)=x^2-9xy+8y^2,求A,B A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x= 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+ 若A=2x²-4xy-2y²-2x+2y,B=4x²-6xy+2y²-3x-y. 设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|