191问答库 > 一本书打八折出售后比原价便宜3元钱这本书原价多少元

一本书打八折出售后比原价便宜3元钱这本书原价多少元

2025-03-16 12:25:58
推荐回答（1个）
回答1：

解：3÷（1－80%）＝15（元）
答：这本书原价是15元。
说明：一本书打8折出售后比原价便宜3元，原价是单位“1”，用便宜的数（3元）除以便宜（少）的分率（1－80%）等于单位“1”的量（原价）。

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