x/2=y/3=z/4,求x+2y-3z/3y-z的值.

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, 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 x+y/2=z+x/3=y+z/4 x+y+z=27 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 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=? 求适合方程组 3x+2y-z=4 2x-y+2z=6 x+y+z 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 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 x：y：z=2：3：4 求 3x+2y-z/x+y+z 的值