價格：免費
檔案大小：31.8 MB
版本需求：需要 iOS 9.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
A ratio is a way to compare two quantities by using division as in miles per hour where we compare miles and hours. A proportion on the other hand is an equation that says that two ratios are equivalent.
This app is for all people want to improve his knowledge.
Let's study!
支援平台：iPhone, iPad