化简2x-[3y-5x-(2x-7y)],得什么
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
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
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)
把分式2(x-y)/5(x+y)(x-y)化简,得2/5(x+y)时,x,y必须满足的条件
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(2X-3y)-(5x-y)
化简2(2X-7Y)(7Y+2X)+X^2-(-4X+5Y)(-5Y-4X)
[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)
7x+[-3x-3(x-2y)]-[5x-(2x-y)]