求a,b ,c 的值
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求a,b ,c 的值
![](http://img.wesiedu.com/upload/0/ae/0aed791e6cb89c902e30062a19aef63a.jpg)
![](http://img.wesiedu.com/upload/0/ae/0aed791e6cb89c902e30062a19aef63a.jpg)
![求a,b ,c 的值](/uploads/image/z/17040070-46-0.jpg?t=%E6%B1%82a%2Cb+%2Cc+%E7%9A%84%E5%80%BC%26nbsp%3B)
4a - 2b + c = 3 (1)
9a - 3b + c = 5 (2)
16a - 4b + c = 3 (3)
(2) - (1)得:5a - b = 2 (4)
(3) - (2)得:7a - b = - 2 (5)
(5) - (4)得:2a = - 4 解得:a = - 2
把a = - 2 代入(4)得:b = -12
把 a = - 2,b = - 12代入(1)得:c = -13
所以:a = - 2 b = - 12 c = - 13
9a - 3b + c = 5 (2)
16a - 4b + c = 3 (3)
(2) - (1)得:5a - b = 2 (4)
(3) - (2)得:7a - b = - 2 (5)
(5) - (4)得:2a = - 4 解得:a = - 2
把a = - 2 代入(4)得:b = -12
把 a = - 2,b = - 12代入(1)得:c = -13
所以:a = - 2 b = - 12 c = - 13