3x+2y+z=30,3x+y+2z=14,5x+3z=44,3x+2z=?

分类: 作业答案 • 2022-01-09 18:04:33

问题描述：

答

3x+2y+z=30(1)
3x+y+2z=14(2)
5x+3z=44(3)
(2)×2-(1),得3x+3z=12 (4)
(3)(4)得 x=16,z= -12
所以 3x+2z = 24