求适合混合条件组3+2y-z=5,2x-y+2z=9,x+y+z＜7的所有整数解

求满足下列条件的所有正整数解3x+2y-z=4,2x-y+2z=6,x+y+z＜7 已知有理数x、y、z满足条件|x-z-2|+(3x-6y-7)^2+|3y+3z-4|=0,求x、y、z 解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z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x/4=y/5=z/6 求x+y+z/3x-2y+z的值 已知x/4=y/5=z/6,求x+y+z/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. 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z