题目：A=y(x-y)(x-z)+z(x-y)(z-x) 问：（1）将多项式A分解因式（2） x/2=y/3=z/4,求A/（xyz）的值等到5点啊，要有详细过程

(x+y-z)(x-y+z)= 已知：(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z)]/xyz的值已知：(x+y-z)/z=(x-y+z)/y=(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z)]/xyz的值 题目中写错个等号，汗... 填空a(x+y-z)+b(x+y-z)-c(x+y-z)=(x+y-z)乘以() X+Y+Z=? x/y=(x+z)/(y+z)y/z=(x+y)/(x+z) 已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=? x+y+z=12 x-y+z=2 x-z+y+a=90 x+y+a+z=100,求x y z a (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值 z+=x>y?++x: 分式加减的几道题目求速度1 .(x+y)²/（x-z)(y-z) - (y+z)²/（x-z)(y-z) = 2.2x+3y/x-y+2y/y-x-3y/x-y= 求证tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-a)tan(z-x) 用行列式的性质证明：y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证? x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) ＋z-x/(y-z)(y-x) fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14 x=y; y=z; z=x/y x^-(y-z)^/(x+y)^-z^ 计算（x+y-z)(x-y-z) 计算：(x-y+z)(-x+y+z)