解聯立方程
回答 (2)
2011-07-12 7:44 am
✔ 最佳答案
x + 3y = 10 ...... (1)4x - 5y = -11 ...... (2)
(1)*4:
4x + 12y = 40 ...... (3)
(3) - (2):
17y = 51
y = 3
把 y = 3 代入 (1):
x + 3*3 = 10
x = 1
解： x = 1, y = 3
參考: 賣女孩的火柴
2011-07-12 7:08 am
Have many answer:
e.g.
1.10-X/3
X=1.4.7
10-1/3
X=1.4.7 Y=3.2.1
2.-11+5Y=4X
設Y=1
-11+5=4X
-6=4X
X=1.5
e.g.
1.10-X/3
X=1.4.7
10-1/3
X=1.4.7 Y=3.2.1
2.-11+5Y=4X
設Y=1
-11+5=4X
-6=4X
X=1.5
參考: BYＭＥ
收錄日期: 2021-04-13 18:06:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110711000051KK01294