方程组{x/2+y/3-z=-5,x/3-y/2+z/2=10,x/2-y/3-z/4=6,求x,y,z

解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6} 已知方程组4x-5y+2z=0 x+2y=3z 则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 方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z) 已知x,y,z满足方程组：4x-5y+2z=o;x+4y-3x=0,求x:y:z的值 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=—— 已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少 4x-3y-6z=0,x+2y-7z=0是一个方程组,那么x-y+z/x+y+z的值等于 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z