Maths
2013-02-14 12:38 am
A shop bought a number of dictionaries at $100 each and five times that number of novels at $20 each. The total cost of all these dictionaries and novels was $400. How many dictionaries the shop buy?
回答 (2)
2013-02-14 1:00 am
✔ 最佳答案
一間店鋪買了一些字典每人100元，5倍，20元的小說。所有這些字典和小說的總成本為400美元。有多少字典店買嗎？ 
2013-02-14 1:11 am
100x+5*20x=400
200x=400
x=2
200x=400
x=2
收錄日期: 2021-04-16 15:33:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130213000051KK00191