如图,化简|x-y+1|-2|y-x-3|+|y-x|+5
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
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
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
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
x,y在数轴上的位置如图1-1所示,试化简:|x-y+1|-2|y-x-3|+|y-x|+5
数学(x-y)^5*(y-x)^3*(x-y)^2
1、x(x-y)(x+y)-x(x+y)^2
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
[(x+2y)(x-2y)-(2x-y)^+(3x-y)(2x-5y)]除(-2分之1乘x) 化简
化简,并求值2(x-2y)²-4(x+3y)(x-3y)-2(x-y).(y+x)-5(-x-1)²
(2X-3y)-(5x-y)