解方程组{x:y=5:3,y:z=7:,5,2x-y-z=34

解方程组{x:y=5:3,y:z=7:,5,2x-y-z=34 解方程组2x+y-z=7 x+y+z =1 2x-y-z=5 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=4,x+y+2z=5,3x+y-z=6 解三元一次方程组：x/5=y/3 x/7=Z/3 2x-y-z=34 x:z=7:3 x:y=5:3 2x-y-z=34解方程组 y-3x-2z=1 ;x+2y+3z=9 ;5x-7y+z=34 ;解这个三元一次方程组. 三元一次方程组y-3x-2z=1 x+2y+3z=9 5x-7y+z=34怎么解 解方程组：x+3y=5.y-2z=5.x+z=5 x:y:z=2:3:5解方程组 2x+3y-z=16 X:Y=5:3,y:Z=7:5,2X—Y—Z=34.解方程组