(1)+(3)得
y+3z=10 (4)
(2)+(3)×2得
4y+z=22 (5)
(5)×3-(4)得
11y=56
∴y=56/11
把y=56/11代入(4)得
56/11+3z=10
z=18/11
把y=56/11,z=18/11代入(1)得
x-56/11+36/11=6
x=86/11x = 6，y = 4，z = 2吧，你验算试一下，看看对不对，x = 6，y = 4，z = 2这个我验算了，是正确的(1)+(3)得y+3z=10 (4)(2)+(3)×2得5y+z=22 (5) 刚才这里我错了，怪不得答案这么烦(5)×3-(4)得14y=56∴y=4把y=4代入(4)得4+3z=10z=2把y=4,z=2代入(1)得x-4+4=6x=6