X+3Y=2.3Y+Z=4.Z+3X=6解方程

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) x+y+z=6 x+2y+3z=14 y+1=z X+3Y=2.3Y+Z=4.Z+3X=6解方程 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 三元一次方程解 1.{x+y-z=5 {3x+2y+z=2 {2x-2y+z=-31.{x+y-z=5 2.{9x-5y+x=-6 3.{x-y=3 4.{x+y=3 5.{4x-2y+z=7{3x+2y+z=2 {9x+y-2z=3 {x+z=7 {y+z=4 {2x-y-3z=28{2x-2y+z=-3 {-9x+3y-5z=0 {y-z=6 {z+x=5 {x+y-2z=13 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z 已知x+y+z=0求证x*x*x+y*y*y+z*z*z=3xyz 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0 3x-y+z=4,2z+3y-z=12,x+y+z=6的解 x/2=y/3=z/5 x+3y-z/x-3y+z (x+y-z)(x-y+z)= x+y/2=z+x/3=y+z/4 x+y+z=27 若x+y+z=3y=2z,则x/x+y+z=? x+2y=3x+2z=4y+z 求x:y:z 6x+5y+3z=100 x+y+z=30 求 x y 已知3X=4X,5Y=6Z求X+Y：Y+Z x,y,z不是0.3z=4y,z=3x求（x+y）：（x+z）.