若X/2=Y/3=Z/-5,求2X+Y+3Z/2X的值!

已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 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. 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 若2分之x+y=3分之y+z=5分之x+z 且x+y+z=18 求x,y,z的值 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+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 x+y+z=35 2x-y=5 y/3=z/2 求x,y,z x+2y=3x+2z=4y+z 求x:y:z 若x,y,z,满足3x+2y+z=5,2x+y-3z=1.y是非负数.求z的取值范围 1.若3x-2y+z=2;3x+2y+5z=4,求x+22.若x-3y+z=0;3x-3y-4z=0,求x:y:z 若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z 若|x-2|+|Y+3|+|z-5|=O计算求|x|+|Y|+|z|的值 若|x-2|+|y+3|+|z-5|=0,求|x|+|y|+|z|的值. 3x=4y 2y=5z 试求x:y:z 若X.Y.z满足2X+3Y+z=18,4X-3Y+5z=24,求X+3Y的值 若X/3=Y/4=Z/5,求（X+Y)/(X-2Y+3Z)的值 3x-y=-7,y+2z=2,2x-2z=-5 求x,y,z x+y-z=5,2x+3y+z=10,x-2y-z=20求方程组