求方程，(文字題)(英文)，要列式，不用答案。?
回答 (1)
2015-08-25 6:20 am
✔ 最佳答案
25.Number of male students in this month
= 30 × (1 ‒ r%)
Number of female students in this month
= 20 × (1 + r%)
The number of male and female students are the same in this month :
30 × (1 ‒ r%) = 20 × (1 + r%)
30 ‒ 0.3r = 20 + 0.2r
...... solve for r.
收錄日期: 2021-04-18 00:04:58
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150824215223AAjTzMZ