diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 94f8923..14ca09f 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2632,8 +2632,7 @@
 							  Suppose that E was repeated n times under similar conditions.
 							  Let fn (A) be the times that A occurs. The ration
 							  $$Fn (A) =
-							  fn (A) /
-							  n$$
+							  \frac{ fn (A)}{n}$$
 							  is said to be the frequency of event A in the n trials. If n is
 							  large enough, the probability of event A will be approximated
 							  by Fn (A).