您可以在以下网站上找到《线性代数学方法》的PDF文件：

1. Amazon：https://www.amazon.com/Linear-Algebra-Methods-Applications-Mathematics/dp/1498717093

2. Google Books：https://books.google.com/books?id=V6V6DwAAQBAJ&printsec=frontcover&dq=linear+algebra+methods&hl=en&sa=X&ved=2ahUKEwjV_5yV_5XrAhVQTd8KHVVfCzQQ6AEwAHoECAAQAg#v=onepage&q=linear%20algebra%20methods&f=false

3. Springer：https://link.springer.com/book/10.1007/978-1-4987-1709-3