(4x^2y+5xy-7x)-(5x^2y+4xy+x);(6a^2-8a+11b^3)-(11a^2+2b^3)急用,最好十分钟内给我答案
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(4x^2+5xy-7x)-(5x^2y+4xy+x)
因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
化简:3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
化简(5x×2y+5xy-7x)-(4x×2y+5xy-7x)的结果
先化简,再求值:-4x+7x-5-3x-6x+2,其中x=-2分之1 4xy-3x-xy先化简,再求值:-4x+7x-5-3x-6x+2,其中x=-2分之14xy-3x-xy+y+x-3xy-2y+2x+x,其中x=-5,y=-1
2X^+XY-Y^-4X+5Y-6
2x^+xy-y^-4x+5y-6=?
3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程(2) 5xy-4x²y-8xy²+3xy-xy²+4x²y
因式分解:-x平方+4x-4;8(x平方-2y平方)-x(7x+y)+xy,4x三次方-4x平方y-(x-y),x平方y-5xy平方+6y三次方
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)²
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值