化简：1/2x-1/(x+y).[(x+y)/2 - （2x²+2xy)/2x]

化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) 2x分之1- x+y分之1(2x分之x+y -x-y)化简 化简1/2x-1/x+y（x+y/2x-x-y） 1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简 化简：[(2x-y)平方+（2x+y)(2x-y)-4x(x-y+1)]÷2x 化简(2x+y)(2x-y)-(x+2y)(x-2y-1) 化简：y=|x-1|+|x+2| (x/x+y-x/y-x-2xy/x.x-y.y)/(1/x-1/y) 分式化简 化简 x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x}过程一步一步的列好x-[y-2x-(x-y) -9-4[2x-5(x+1)] 2x-3{y-[3x-(2y-x)]-2x} 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 化简y(x+y)+(x+y)(x-y)-x^2 [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) (x-y)(2x-y-1) 计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2 化简,求值：[(x/y)-(y/x)]除以[(x/y)+(y/x)-2]除以[1+(y/x)],其中x=1/2,y=1/3 化简：(x-y)/(2x+1) * [(2x+1)/(x+y) - (2xy+y)/(y方－x方)]+y/(x+y)