求3x 2y 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.
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3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
x/3=y/4=z/5,求x+y+z/3x-2y+z的值,
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
x+2y+3z=20,x+3y+5z=31,求x+y+z的值
已知2x=3y=4z求2x-y+z分之x+y+z的值
已知x:y:z=2:3:4求x-y+z分之x+y-z的值
已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值.
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
16.设x+y+z=3y=2z ,求x/(x+y+z)的值5.7