2x+3y+z=11,x+y+z=6,3x-y-z=-2求解
问题描述：
2x+3y+z=11,x+y+z=6,3x-y-z=-2求解
答
2x+3y+z=11,.①
x+y+z=6,.②
3x-y-z=-2.③
①+③
5x+2y=9.④
②+③
4x=4
x=1
代入④
5+2y=9
y=2
代入②
z=3
x=1,y=2,z=3