化简:(2x-3y)-(5x-y)
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
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)
(2X-3y)-(5x-y)
化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
-(5x+y)-3(2x-3y)(化简)
[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)
化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
(2x+3y)(3x-2y)-(x-2y)(x+2y)化简