diff --git a/Book4_Ch11_矩阵分解__数学要素__从加减乘除到机器学习.pdf b/Book4_Ch11_矩阵分解__数学要素__从加减乘除到机器学习.pdf
index fc61b6d..8c9bb26 100644
Binary files a/Book4_Ch11_矩阵分解__数学要素__从加减乘除到机器学习.pdf and b/Book4_Ch11_矩阵分解__数学要素__从加减乘除到机器学习.pdf differ