《數學9：MYP 4》第三版專為國際文憑中學計畫 (IB MYP) 數學框架設計和編寫，全面涵蓋了所概述的內容和期望。

本書適合完成MYP數學架構標準版或擴充版內容的學生，其中擴充版內容在文中以藍色標示。

本書各章均採用討論、活動、調查和研究練習來加深概念理解。內容以清晰易懂的風格呈現，有助於理解和記憶，特別適合英語學習者。每章結尾都包含豐富的複習題集和線上多項選擇測驗。

相關的Snowflake數位訂閱服務為學生和教育工作者提供了互動且引人入勝的資源，從而支持教材內容。

全球背景計畫強調了數學在理解歷史、文化、科學、社會和環境中的應用。我們致力於提供豐富多元的主題和風格，激發所有學生的興趣，並展現數學在現實世界中的應用。

本書的編寫諮詢了全球經驗豐富的IB數學教師，但獨立於國際文憑組織（IBO）。本書並未獲得IBO的認可。

Mathematics 9 MYP 4 third edition has been designed and written for the International Baccalaureate Middle Years Programme (IB MYP) Mathematics framework, providing complete coverage of the content and expectations outlined. 

This book is suitable for students completing the Standard or Extended content of the MYP Mathematics framework, with Extended only content labeled blue within the text. 

Discussions, Activities, Investigations, and Research exercises are used throughout the chapters to develop conceptual understanding. Material is presented in a clear, easy-to-follow style to aid comprehension and retention, especially for English Language Learners. Each chapter ends with extensive review sets and an online multiple-choice quiz. 

The associated digital Snowflake subscriptions supports the textbook content with interactive and engaging resources for students and educators. 
The Global Context projects highlight the use of mathematics in understanding history, culture, science, society, and the environment. We have aimed to provide a diverse range of topics and styles to create interest for all students and illustrate the real-world application of mathematics. 

We have developed this book in consultation with experienced teachers of IB Mathematics internationally, but independent of the International Baccalaureate Organisation (IBO). It is not endorsed by the IBO. 

We have endeavored to publish a stimulating and thorough textbook and digital resource to develop and encourage student understanding and nurture an appreciation of mathematics.