x-3y-2z=27 2x+3y+z=-5 3x+3y-z=4

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x-3y-2z=272x+3y+z=-53x+3y-z=4x-3y-2z=272x+3y+z=-53x+3y-z=4x-3y-2z=272x+3y+z=-53x+3y-z=4x-3y-2z=27(1)

x-3y-2z=27 2x+3y+z=-5 3x+3y-z=4
x-3y-2z=27 2x+3y+z=-5 3x+3y-z=4

x-3y-2z=27 2x+3y+z=-5 3x+3y-z=4
x-3y-2z=27 (1)
2x+3y+z=-5 (2)
3x+3y-z=4 (3)
(1)+(2)得：3x-z=22 (4)
(1)+(3)得：4x-3z=31 (5)
(4)×3-(5)得：5x=35,x=7
代入（4）解得：z=-1
把x和z的值代入（3）解得：y=-6
所以,方程组的解是：
x=7
y=-6
z=-1

(1)+(2)得
3x-z=22 (4)
(1)+(3)得
4x-3z=31 (5)
(4)×3-(5)得
5x=35
∴x=7
把x=7代入(4)得
z=-1
把x=7，z=-1代入(1)得
y=6
∴方程组的解是
x=7
y=6
z=-1

怎么。。。

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