x=3y 3y ÷z=6 x=( )z

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 已知：4x-3y-6z=0,x+2y-7z=0.求出x-y+z÷x+y+z=? 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 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）. 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)