-(3ab)×(-4b^2)和(2x^2y)^3×(-4xy^2)咋算
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy
当ab为何值时,关于xy的多项式3x^2y^3+(b+5)/2x^2y^2+xy^2+y+6a+4没有常数项和四次项
1.4x^2 y+3xy^2-x^2 y-3xy^2 -3 2.3(3a^2-2ab)-2(4b^2-ab) 3.2x-
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
因式分解 (1)x^3+XY-X-XY^2 (2)4ab-(1-a^2)(1-b^2 ) (3)9x方-6x+2y-y方
整式计算题.(急.-(-2b^2*b)^46x^2*3xy2ab^2*(-3ab)4x^2y*(-xy^2)^3(1.3
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
利用x-y=3^2009,xy=-3^2010,求代数式:(2x+3y-2xy)-(x+4y+xy)-(3xy+2y-2
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
已知x-y=4,xy=-2,求代数式(2x+3y-2xy)-(x+4+xy)-(3xy+2y-2x)的值
合并同类项.)3x-2x-x -3a+2b-2a-3b3a^2b+4ab^2-a^2b-7ab^2 3x^2-2xy+y