(|x+1|+|x-2|)(|y-2|+|y+1|）（|z-3|+|z+1|）=36 求x+2y+3z的最大值

[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y (x/x+y-x/y-x-2xy/x.x-y.y)/(1/x-1/y) 分式化简 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) (x-y)(2x-y-1) 因式分解x(x+y)(x-y)-x(x+y)^2 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简y(x+y)+(x+y)(x-y)-x^2 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=2 （x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3. 计算：1/2x-1/x+y×（x+y/2x-x-y) 1/2X-1/X+Y*(X+Y/2X-X-Y)等于多少, 计算:1/(2x) - 1/(x+y)（(x+y)/(2x) - x - y） 1/(2x) - 1/(x+y)*((x+y)/(2x)-x-y) 计算.