1)b重a20%,c重b25%.c重a幾多%. (最好方程)
2)Peter用15%折扣買左本書,佢慳左6蚊.問marked price.
收錄日期: 2021-04-14 18:22:21
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071230000051KK01258