maths~~~~~
回答 (1)
2010-04-05 9:15 am
✔ 最佳答案
濃度 = 40/(250-40) = 4/21需要濃縮橙汁 = x
x/(700 - x) = 4/21
21x = 4(700 - x)
25x = 2800
x = 112 mL
收錄日期: 2021-04-23 20:41:07
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100405000051KK00085