—2x+5(x+2y)—(x—3y) 3x+2(y-x)-(-x-4y) (x-2y)-(y-3
数学(x-y)^5*(y-x)^3*(x-y)^2
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
【x-3y][x+y]-[x-2y][x +2y]-[x-y
有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
(2X-3y)-(5x-y)
(x+3y-4)(2x-y)
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
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)