3x+2y+z=14 { x+y+z=10 2x+3y-z=1

x+y+z=6 x+2y+3z=14 y+1=z 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 (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. 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) [3x+2y+z=14,x+y+z=10,2x+3y-z=1] 3x+2y+z=14 { x+y+z=10 2x+3y-z=1 3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5 3x+2y+z=14 x+y+2z+-3 2x+3y-z=1 解方程：x+z=y (1) ,7z-(x+y)=2 (2) ,x+y+z=14 (3) 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 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)=? matlab解对数方程组[x,y,z]=solve('0.29744*x/(3+0.1*x+y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)))^2','0.79*x/(3+0.1*y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.1*y+z)))^2','1.25*x/(3+0.1*z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.*1y+z)*(3+z)/ {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 如果,根号x-3+| y-2 |+z^2=2z-1 求 （x+z)^y 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= 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0