12x^2y*(-2/3x^2-5/6xy+3/4y^2)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
因式分解 求过程 x-xy+3y-3x 2x+xy-y-4x+5y-6
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
x*-2xy+3y*=9 4x*-5xy+6y*=30
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)
xy=-2,x+y=3,求代数式(4xy+12y)+[7x-(3xy+4y-x)]
x^2-xy-6y^2+3xy+y+2
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值