解方程组{X+Y+Z=51 4X+8Y+5Z=300 X+Y+2Z=61

解方程组{X+Y+Z=51 4X+8Y+5Z=300 X+Y+2Z=61 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 解方程组：x：y：z=4：7：8,x+y+2z=54 x+y+z=51 4x+8y+5z=300 x+y+2z=67 解方程组x-y-3z=4 3x+y-z=6 -x+3y+z=8 解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3 解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3 解方程组2x+y-z=7 x+y+z =1 2x-y-z=5 解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7. 解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6} x+y/2=z+x/3+y=z/4,...x+y+z=27.解方程组. 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z