x^2+3y^2+4z^2=2,求|x+3y+4z|小于等于4.

x+2y=3x+2z=4y+z 求x:y:z 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, (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z. 求适合方程组 3x+2y-z=4 2x-y+2z=6 x+y+z x：y：z=3:4:7 2x-3y+z=18 求：3x-2y+z x+2y+3Z=10,4x+3y+2z=15,求x+y+z= 如果x/2=y/3=z/4,求(2x-y+3z)/(x+y-z)的值 2x+Y+3z=23,x+4y+5z=36,求X+2Y+3z~ 已知x/3=y/4=z/2,求x+2y-z/x+y+z=? 若x:y:z=2:3:4,求x+y+z/x-2y+3z的值 x：y：z=2：3：4 求 3x+2y-z/x+y+z 的值 x：y：z=2:3:4,x+2y-z=12,求x,y,z 已知X:Y:Z=3:4:5,求4X+3Y-2Z/X+Y+Z的值 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.