解方程组：(x+2y)÷3=(2y-3z)÷6=(x-3z)÷9 1/2 x+y-3/2 z=9

解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值 解方程组1、4x+9y=12,3y-2z=1,2x+6z=32、3x-y+2z=3,2x+y-3z=11,x+y+z=1 已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=—— 解方程组：x-2y+z=-1,x+y+z=2,x+2y+3z=-1 解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6} 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 解方程组x-2y=-9 y-z=3 2z+x=47 解三元一次方程组：x+y+z=6,y-z=4,x-y-2z=3, 解三元一次方程组,1.{x=2y-9z {x+2y-3z=2 {x-2y+6z=12.{x-2y=z {3x+2y=1 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{x:y:z=1:2:3 {2x+y-3z=15