解方程组 x:y=2:3 y:z=4:5 x+y+z=35

解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 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{3x+y-z=4,2x-y+3z=12,x+y+z=6} 解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7. 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 解三元一次方程组：x+y+z=6,y-z=4,x-y-2z=3, 方程组3x+4y+z=14 x+5y+2z=17 2x+2y-z=3 解方程组 解方程组：{x/2=y/3=z/4 2x+y+z=22 解方程组：x+3y=5.y-2z=5.x+z=5 x/2=y/3=z/4 x+y+z=18 求方程组解