若x:y:z=2:3:4,求x+y+z/x-2y+3z的值

x+2y=3x+2z=4y+z 求x:y:z 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 若x:y:z=2:3:4,求x+y+z/x-2y+3z的值 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z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. 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,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 (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z 已知x/2=y/4=z/7,求①x：y：z.②若2x+y+3z=58,分别求x,y,z的值.③求x+y/x+z的值. 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X：Y：Z=2：3：4求X+Y+Z/X-2Y+3X的值 已知x:y:z=2:3:4,求x-y-z/3x+2y-z的值.若2x+3y-4z=-3,求3x-4y-z的值 x,y,z不是0.3z=4y,z=3x求（x+y）：（x+z）. 若x:y:z=3:4:5=6,求x-y+z分之x+y-z的值 若x:y:z=3:4:5且x+y+z=24,求x、y、z的值