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幫手計計...thx
數學題 二次一次方程....
2008-01-21 4:52 am
回答 (1)
2008-01-21 5:42 am
✔ 最佳答案
3(13-x) = 5y-1139 - 3x = 5y - 11
- 3x = 5y - 50
x = (50-5y)/3
2(x+y) = 5y-11
2x + 2y = 5y-11
2x = 3y - 11
x = (3y-11)/2
(50-5y)/3 = (3y-11)/2
100 -10y = 9y - 33
133 = 19y
y = 7
x = (3*7-11)/2 = 10/2 = 5
so, x=5, y=7
參考: 自己
收錄日期: 2021-04-14 19:50:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080120000051KK03895