Question

3x+2y=1,2x-y+z=-4 x+zy-z=3过程...

Answer 1

{3x+2y=1,①

{2x-y+z=-4 ②

{x+2y-z=3 ③

②+③得3x+y=-1 ④

①-④得y=2

把y=2代入④得3x+2=-1

x=-1

把x=-1,y=2代入②得-2-2+z=-4

z=0

所以原方程组的解是

{x=-1

{y=2

{z=0