在超級市場買可樂,現有買6鑵送1鑵的優惠.係呢個優惠下,買7鑵可樂,每鑵平幾多蚊?
(可樂每鑵9.1)
問一個數學題ge式
2007-09-26 1:07 am
回答 (3)
2007-09-26 1:11 am
✔ 最佳答案
買7鑵可樂under買6鑵送1鑵的優惠:9.1X6/7
=7.8
買7鑵可樂under normall case:
9.1X7/7
=9.1
so, 9.1-7.8
=1.3
每鑵平$1.3
2007-09-25 17:12:42 補充：
一條式：9.1X7/7-9.1X6/7=$1.3
2007-09-26 12:17:35 補充：
一條式寫晒就係咁樣：(9.1X7)/7-(9.1X6)/7=[ 9.1X (7-6) ] / 7=$1.3 每鑵平$1.3
2007-09-26 3:23 am
(7x9.1)/7-(6x9.1)/7
=9.1-7.8
=$1.3
=9.1-7.8
=$1.3
2007-09-26 3:00 am
每鑵平
= $ [ 9.1 ( 7-6 )/7 ]
= $ ( 9.1*1/7 )
= $ 1.3
= $ [ 9.1 ( 7-6 )/7 ]
= $ ( 9.1*1/7 )
= $ 1.3
收錄日期: 2021-04-13 13:36:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070925000051KK01950