2x+y-z=10 ,x+3y+2x=14 ,3x-y-2z=7

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2x+y-z=10 ,x+3y+2x=14 ,3x-y-2z=7
2x+y-z=10 ,x+3y+2x=14 ,3x-y-2z=7

2x+y-z=10 ,x+3y+2x=14 ,3x-y-2z=7
设2x+y-z=10为（1） ,x+3y+2z=14 为（2）,3x-y-2z=7为（3）
（2）+（3）得
4x+2y=21,设这个式子为（4）
(1)*2-(3)得
x+3y=13,设这个式子为（5）
（5）×4-（4）得
10y=31
得y=3.1
将y代入（5）得
x=3.7
将x=3.7,y=3.1代入（1）
得z=0.5

题目抄错了吧第2个方程`
(1)2x+y-z=10
(2) x+3y+2z=14
(3) 3x-y-2z=7
(1)+(3)得5x-3z=17
(2)+(3)x3得10x-4z=35
就这样解，解出来代回去

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