書包題.......10分
回答 (2)
2007-05-20 4:03 pm
Let a be the price of school bag
aX80%X10=(a-30)X12
0.8aX10=12a-360
8a=12a-360
360=12a-8a
360=4a
a=90
The price of a school bag is $90
aX80%X10=(a-30)X12
0.8aX10=12a-360
8a=12a-360
360=12a-8a
360=4a
a=90
The price of a school bag is $90
收錄日期: 2021-04-29 19:24:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070520000051KK00728