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用消元法，解下列聯立方程：
3x+2y =2----------(1)
2x =8----------(2)
數學~聯立方程問題用消元法~急
2008-01-07 11:43 pm
回答 (1)
2008-01-08 12:18 am
✔ 最佳答案
3x+2y =2----------(1)2x =8----------(2)
(1) * 2 : 6x+4y = 4 ------- (3)
(2) * 3 : 6x = 24 -------- (4)
(3) - (4) : 4y = -20
y = -5
把 y= -5 代入 ( 1 )
3x + 2 (-5) = 2
3x = 12
x = 4
所以 , x = 4 和 y = -5
收錄日期: 2021-04-13 14:55:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080107000051KK01762