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[add]:添加矩阵乘法结合律

sangxin 3 years ago
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      docs/chapt7/7.1.1数学基础.md

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docs/chapt7/7.1.1数学基础.md
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@@ -96,6 +96,8 @@ $$
 
 
 - 结合律：$(A+B)+C=A+(B+C)$
 
 
+- 乘法结合律：$(AB)+C=A(BC)$
 
+
 
 **栗子：**
 
 
 $$