Question

解方程组：2x+y+z=-4 x+2y+z=-2 x+y+2z=3

Answer 1

2x+y+z=-4

x+2y+z=-2

x+y+2z=3

2x+y+z=-4

2x+4y+2z=-4

x+y+2z=3

x-y=-2

x+3y=-7

4y=-5

y=-5/4

x=y-2=-13/4

z=-2-x-2y=-2-(-13/4)-2(-5/4)=15/4