赠送 二手原文书，希望是能真的用得上的人再索取
不限制一人索取数量，看状况安排吧
有些书内有笔记但是保证都整齐干净
1. Calculus concepts & contexts 3 - James Stewart
2. University physics - Harris Benson
3. Linear Algebra with applications 8 ver. Steven J. Leon
4. Elements of Discrete Mathematics, computer science series - McGraw Hill
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