为什么4(x-y)^3等于4x^3-4y^3+12xy^2-12x^2y如题 谢谢了
xy=-2,x+y=3,求代数式(4xy+12y)+[7x-(3xy+4y-x)]
2(xy^2+3y^3-x^2y)-(-2x^2y+y^3+xy^2)-4y^3等于多少x=2,y=3
已知x-y的绝对值等于4,xy=-3,xy^2+x^2y=?
已知x^2y等于3,求2xy(x^5y^2-3x^3y-4x)
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)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
若1/x+1/y=3,4y-2xy-4x/3x+xy-3x等于多少
麻烦你们团队了:计算:1、(6xy^2-12x^3y^4+2x^2y^2)/(-2xy^2) 2、8(x-y)^4(x+
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)+2x^4y^2÷(xy)^2
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
已知3x^2+xy-4y^2=0【x不等于y],那么x/y等于多少