X+Z=Y14=X+Z+Y3X+2Y+Z=29这是个方程组给我整个过程

X+Z=Y14=X+Z+Y3X+2Y+Z=29这是个方程组给我整个过程 请大家帮我解个方程组X+Z=Y14=X+Z+Y3X+2Y+Z=29这是方程组 (x-2y+z)(x+y-2z)分之（y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y) + (y+z-2z)(x-2y+z)分之（x-z)(y-z)=?第三部分那个是 （y+z-2x)(x-2y+z)分之（x-z)(y-z) (x+y-z)(x-y+z)= 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? 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值 X+Y+Z=? x/y=(x+z)/(y+z)y/z=(x+y)/(x+z) (x+y-z)^2-(x-y+z)^2=? (x-y-z)*( )=x^2-(y+z)^2 填空 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)=? 几道三元一次方程题算了几遍都是这个结果 没有也无所谓!（1）3X-y+Z=42X+3Y-2Z=123X+2Y=66(2）x+y=3y+z=5x+z=3(3)z=x+y3x-2y-2z=52x+y-z=3(4)x+y-z=-5x-y-z=1x-y+z=15(5)a+1=3b+3=43c-1=5能做几道做几道要准确 做得对 多 我 分解因式:f(x,y,z)=x^2(y-z)+y^2(z-x)+z^2(x-y) 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0 (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值