若1/2x=1/3y=1/4z且xyz不等于0,求x:y:z快者+5

若1/2x=1/3y=1/4z,且xyz≠0,求xyz最后一段为“求x:y:z” 已知x:y:z=2:3:4,且x+y+z=1/12,求xyz的值 已知x,y,z都是正数,且xyz=1,求证：x^2/(y+z)+y^2/(x+z)+z^2/(x+y)≥3/2 xyz-【2xy-（3xyz-yz）+4xyz】,其中x=2,y=-1/2,z=-1 xyz-【2xy-（3xyz-yz）+4xyz】,其中x=2,y=-1/2,z=-1 3x^2y-[2x^2y-(2xyz-x^2z)-4x^2z]-xyz ,其中x=-2,y=-3,z=1 3x²y-[2x²y-(2xyz-x²z)-4x²z]-xyz,其中x=-2 y=-3 z=1 先化简再求值3xyz+2(x^2y+y^2z-xyz)-xyz+2z^2x x=1 y= -1 z=2 先化简,再求值：3xyz+2(x²y+y²z-xyz)-xyz+2z²x,其中x=1、y=-1、z=2; 若1/2x=1/3y=1/4z且xyz不等于0,求x:y:z快者+5 若2分之1x=3分之1y=4分之1z,且xyz≠0,求x:y:z 若|x|≤3,|y|≤1,|z|≤4,且|x-2y+z|=9,则xyz²是 三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z= 已知x:y:z=3:2:1,且x+y+z=12,则xyz=? xyz∈R+且 x+2y+3z=36求 1/x +2/y +3/z的最小值 (x+y-xy)/(x+y+2xy)=(y+z-2yz)/(y+z+3yz)=(z+x-3zx)/(z+x+4zx),且2/x=3/y=1/z,则xyz=? 已知（x+y-xy）/(x+y+2xy)=(y+z-2yz)/(y+z+3yz)=(z+x-3zx)/(z+x+4zx),且2/x=3/y-1/z,则xyz=? 若xyz=1,求证 x^2/(y+z)+y^2/(z+x)+z^2/(x+y)≥3/2