x+y+z=14 x

fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14 (x+y-z)(x-y+z)= x+y+z=14 7z=x+y+2 x+z=y 14x+4y+z=200,x+y+z=100求解x,y,z x+y+z=14 x 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)=? z+=x>y?++x: x+y+z=6 x+2y+3z=14 y+1=z (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值 x+y+z=28 x+y=16 y+z=14,求x、y、z分别是什么数? 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; y=z; z=x/y (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) (1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1. X ,Y,Z各代表一个数,且满足以下三个等式X+X+Y+Z=17X+Y+Y+Z=14X+Y+Z+Z=13求X,Y,Z的值 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z