∵x：y：z=2:3:4
∴设x=2k,y=3k,z=4k
∵x+2y-z=12
∴2k+6k-4k=12
k=3
∴x=6,y=9,z=12
x：y：z=2:3:4,x+2y-z=12,求x,y,z
3个回答
相关问题
-
2x+5y+4z=6,3x+y-7z=-4,4x+3y+12z=-2 求x+y+z
-
{3x+2y+z=13 x+y+2z=7 2x+3y-z=12,求x,y,z
-
已知x+y/2=y+z/3=z+x/4,且x+2y+z=12,求x-2y+z的值
-
x,y,z满足x+y+z=3,x^2+y^2+z^2=29,x^3+y^3+z^3=45,求x,y,z,x^4+y^4+
-
3x-y+z=4,2x+3y-z=12,x+y+z=6
-
{3x-y+z=4,2x+3y-z=12,x+y+z=6
-
若x+2y+3z=8,4x+3y+2z=12,求x+y+z的值?
-
已知x/2=y/3=z/4,且x+y-z=1/12,求x,y,z
-
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
-
1,{2x+y+z=-26,x+2y+z=-30,x+y+2z=-28 2,{5x+2y+z=12,4x+3y+z=13