分别将上设为⑴ ⑵ ⑶式将1*2得 2X+4Y=8 ⑷用⑵-⑷得3Z-4Y=5 ⑸联立⑶将⑶*3 得9Y+3Z=18然后用⑸-⑶*3可得Y=1然后带入得X=2 Z=3
x+2y=4........(1) 2x+3z=13......(2) 3y+z=6........(3)(1)*2-(2),得4y-3z=-5......(4)(3)*3+(4),得13y=13y=1
