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