{x+y-2=5 (1) {3x+2y+z=2 (2) {2x-2y+z=-3(3)

问题描述:

{x+y-2=5 (1) {3x+2y+z=2 (2) {2x-2y+z=-3(3)

由(1)得x=7-y(4)
代入(2)得z=y-19(5)
以上两项代入(3)求出y
再代回(4)(5)得x和z
x=23/3
y=-2/3
z=-56/3