化简：（1）（x^2-2y^2-z^2)-(-y^2+3x^2-z^2)+(5x^2-y^2+2z^2) (2)-{2a^2b-[3abc-(4ab^2-a^2b)]}

化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(x-2z+y)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z) 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(xy-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)速速回答 化简(x+Y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z) 已知xyz≥0,x+y+z=1,化简x（2y-z）/(1+x+3y)+y(2z-x) /(1+y+3z) +z(2x-y)/(1+z+3x) 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) 化简:(2x-y-z)/(x-y)(x-z)+(2y-z-x)/(y-z)(y-x)+(2z-x-y)/(z-x)(z-y)化简:(2x-y-z)/(x-y)(x-z)+(2y-z-x)/(y-z)(y-x)+(2z-x-y)/(z-x)(z-y)我知道把分母化成一样的、但是之后怎么算? 化简(y-z)^2/(x-y)(x-z)+(z-x)^2/(y-x)(y-z)+(x-y)^2/(z-x)(z-y) 化简(x+y+z)^2-(x+y-z)^2 （x-2y+z）（-x+2y+z） x+2y-z）（x+2y-z） （x+2y-z）(x-2y+z) 化简 (x+y+z)^2 化简(x+y+z)^2-(-x+y+z)^2+(x-y+z)^2-(x+y-z)^2 化简 (x+y+z)^2-(-x+y+z)^ 2+(x-y+z)^ 2-(x+y-z)^ 2 已知x,y,z>0,xyz(x+y+z)=1,求证（x+y）(x+z)>=2 化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z} 分解因式 4a（x-y）²-a²（y-x）³ （x+y+z)（x-y+z）+(y-x+z) (y-x-z)（1）4a（x-y）²-a²（y-x）³ （2）（x+y+z)（x-y+z）+(y-x+z) (y-x-z) 计算:(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)