x+2y+3z=12,且x*+y*+z*=xy+yz+zx.求x的﹣z次方的y次方根 *代表2

已知x+y/2=y+z/3=z+x/4,且x+2y+z=12,求x-2y+z的值 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 如果x+4/3=y+z/2=z+8/4,且x+y+z=12,求x,y,z的值. 如果x/2=y/3=z/4,且x+y+z=18,那么x+y-z=? 已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值. 已知x:y:z=2:3:4且x+z-y=36求x+y+z的值 已知x:y:z=2:3:4,且x+z-y=36.求x+y+z的值 已知x:y:z=2:3:4,且x+y+z=18.求x、y、z的值. 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) X=3z X+y+z=12 X+2y-2z=10 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 已知x+y/2=y+z/2=x+z/4,且x+2y+z=12,求x-2y+z的值（x+y）/2=（y+z）/2=（x+z/）4 若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z 已知x=y/3=z/5.且x+y-2z不等于0.求2x+3y-z/x+y-2z的值是多少 已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值 已知方程组{2x-3y+z=0 且x*y*z不等于0 求 x：y：z {3x-2y-6z=0 已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值