化简:(4x-3y)-[-(2x+y)+(x-y)]-5x
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
(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)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
化简:(2x-y)²-4(x-y)(x+y)
数学(x-y)^5*(y-x)^3*(x-y)^2
3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y) 化简合并同类项
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)