數學題!!有無人識？
2007-08-17 8:42 pm
A boy has twenty $2 coin and twenty $5 coins. In how many ways can he buy a gift that costs $96 if he has pays the exact price for the gift?
回答 (1)
2007-08-17 9:03 pm
✔ 最佳答案
The total amount that the boy has:$2 x 20 = 40
$5 x 20 = 100
This sort of question can only use the trial and error manual method to find the answer.
There is 4 ways he can pay the exact amount.
1. 18 x $5 + 3 x $2
2. 16 x $5 + 8 X $2
3. 14 X $5 + 13 X $2
4. 12 x $5 + 18 X $2
收錄日期: 2021-04-18 23:06:27
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070817000051KK01777