diff --git a/Book4_Ch02_向量运算__矩阵力量__从加减乘除到机器学习.pdf b/Book4_Ch02_向量运算__矩阵力量__从加减乘除到机器学习.pdf
index 5f73208..ffd2eca 100644
Binary files a/Book4_Ch02_向量运算__矩阵力量__从加减乘除到机器学习.pdf and b/Book4_Ch02_向量运算__矩阵力量__从加减乘除到机器学习.pdf differ