若2X-3Y+4Z=2,4X+3Y+2Z=4,则X+Y=多少
x-3y+z=0,3x-2y-4z=0,则x:y:z=多少?
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
若x-2y+4z=1,x+3y-7z=0,则y:z=?
已知,x/2=y/3=z/4,则(2x+y-z)/(3x-2y+z)=?
已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
已知2x+5y+4z=15.7x+y+3z=14 则x+y+z=?
x+2y-4z=0 3x+y-z=0,则x:y:z=
x+2y-4z=0,3x+y-z=0,则x:y:z=?::
若x:y:z=2:3:4,求x+y+z/x-2y+3z的值