如果X+y=1,y+Z=2,Z+X=3,则y的值为（）?

如果,根号x-3+| y-2 |+z^2=2z-1 求 （x+z)^y 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 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 x+y+z=6 x+2y+3z=14 y+1=z 如果x=3y,z=x/2,那么(x-y+z)/(x+y+z)=多少? 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)=? 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 如果x/2=y/3=z/4,且x+y+z=18,那么x+y-z=? 如果x/2=y/3=z/4,求(2x-y+3z)/(x+y-z)的值 如果2x-3y=z x+3y-14z=0 求x:y:z 快, 如果x:y=2:3,y:z=4:3,则x:y:z= 如果x:y=3:2,y:Z=4：2,那么x：y：Z= 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)/ 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0 {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2