AMC 10 Prep Ch 4 Ratios and Proportions — Full Solutions to the Chapter Problems

AMC 10 Preparation 第1册 第4章 比与比例（Ratios and Proportions）——课后习题全解，完整一次讲完。 Complete English walkthrough of AMC 10 Preparation, Volume 1, Chapter 4: Ratios and Proportions — Full Solutions to the Chapter Problems. 本视频为 AMC 10 Preparation 教材的英文讲解，画面为书页原文，配英文讲解与带中文注释的字幕。书中的错误已在视频中口头更正。