若x:y:z=3:5:7,3x+2y-4z=9,则x+y+z的值为( )
若x:y:z=3:5:7,3x+2y-4z=9,则x+y+z的值为( )
若4x=7y+5z,2x+y=z,则x:y:z的值为
若2x+5y-4z=0,3x+9y-7z=0,则x+y-z的值为
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.
若x:y:z=3:4:6,则x-y+z分之x+y-z的值为?
5,若x+2y+3z=10,4x+3y+2z=15,则x+y+z的值为( )
若5分之x=4分之y=3分之z(z不等于0),则3x-2y分之x+y+z的值为
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
若2x+5y+4z=0,3x+y-7z=0,则x+y-z的值等于( )
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
若x/3=y/4=z/5,则x+2y+3z/2x的值为