5x+4y+z=0 3x+y-4z=11 x+y+z= -2 组成的方程组3个方程合在一起的方程组

5x+4y+z=0 3x+y-4z=11 x+y+z= -3 1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38 三元一次方程组 x+y+z=6 x-z=2 2x-y+z=5 三元一次方程组x+y-z=-3 2x+y-3z=-2 3x-y+2z=-11三元一次方程组5z-4y=0 3y-5z=0 2x-y+z=6 已知：4x-5y+2z=0 x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____. (x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z 三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z= 2x+z=10 x+y-z=4 3x-y-z=0 2x+3y+z=0 3x+y-4z=11 x+y+z=-3 2x+3y+z=0 3x+y-4z=11 x+y+z=-3 已知x+4y-3z=0,4x-5y+2z=0,则x：y：z 5x+4y+z=0 3x+y-4z=13 x+y+z=—2 已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 2x+3y-z=9,x+y+z=15,5x-4y-z=0 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z (x+y)/3=(y+z)/5=(z+x)/4 ,xyz不等于0,求x:y:z 若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?