請求以下的A、B、C (其中一個是負數):
2A + 2B = 2
1B + 3C = 15
2A + 1B + 1C = 3
求未知數 - 10點 (急!!! 急!!! 急!!! )
2006-12-19 1:46 am
回答 (3)
2006-12-19 1:51 am
✔ 最佳答案
2A + 2B = 21B + 3C = 15
2A + 1B + 1C = 3
先代晒做c
2A + 2B = 2
a+b=1
a=1-b
1B + 3C = 15
b=15-3c
a=1-15+3c
a=3c-14
2(3C-14)+15-3c+c=3
6c-28+15-3c+c=3
4c=16
c=4
b=3
a=-2
2006-12-19 1:55 am
2A + 2B = 2
1B + 3C = 15
2A + 1B + 1C = 3
先代晒做c
2A + 2B = 2
a+b=1
a=1-b
1B + 3C = 15
b=15-3c
a=1-15+3c
a=3c-14
2(3C-14)+15-3c+c=3
6c-28+15-3c+c=3
4c=16
c=4
b=3
a=-2
1B + 3C = 15
2A + 1B + 1C = 3
先代晒做c
2A + 2B = 2
a+b=1
a=1-b
1B + 3C = 15
b=15-3c
a=1-15+3c
a=3c-14
2(3C-14)+15-3c+c=3
6c-28+15-3c+c=3
4c=16
c=4
b=3
a=-2
收錄日期: 2021-04-22 00:29:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061218000051KK02483