diff --git a/assets/section_2.2_1686907456219_0.edn b/assets/section_2.2_1686907456219_0.edn
index abafa22..5b0d12d 100644
--- a/assets/section_2.2_1686907456219_0.edn
+++ b/assets/section_2.2_1686907456219_0.edn
@@ -231,5 +231,17 @@
                           :rects (),
                           :page 44},
                :content {:text "[:span]", :image 1686915213991},
+               :properties {:color "yellow"}}
+              {:id #uuid "648c48ac-76be-4848-af0d-1532467c8d68",
+               :page 46,
+               :position {:bounding {:x1 42,
+                                     :y1 119.58203125,
+                                     :x2 643,
+                                     :y2 459.58203125,
+                                     :width 677.2919999999999,
+                                     :height 507.96853333333326},
+                          :rects (),
+                          :page 46},
+               :content {:text "[:span]", :image 1686915243826},
                :properties {:color "yellow"}}],
- :extra {:page 44}}
+ :extra {:page 47}}
diff --git a/assets/section_2.2_1686907456219_0/46_648c48ac-76be-4848-af0d-1532467c8d68_1686915243826.png b/assets/section_2.2_1686907456219_0/46_648c48ac-76be-4848-af0d-1532467c8d68_1686915243826.png
new file mode 100644
index 0000000..f8adb04
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diff --git a/pages/hls__section_2.2_1686907456219_0.md b/pages/hls__section_2.2_1686907456219_0.md
index 86b18be..9344027 100644
--- a/pages/hls__section_2.2_1686907456219_0.md
+++ b/pages/hls__section_2.2_1686907456219_0.md
@@ -66,4 +66,11 @@ file-path:: ../assets/section_2.2_1686907456219_0.pdf
   hl-color:: yellow
   id:: 648c488f-85fa-4203-8092-07176b38fce9
   hl-type:: area
-  hl-stamp:: 1686915213991
\ No newline at end of file
+  hl-stamp:: 1686915213991
+- [:span]
+  ls-type:: annotation
+  hl-page:: 46
+  hl-color:: yellow
+  id:: 648c48ac-76be-4848-af0d-1532467c8d68
+  hl-type:: area
+  hl-stamp:: 1686915243826
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 334a7c0..e7bc46f 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2708,7 +2708,9 @@
 						- ((648c2d05-82d4-472f-901c-b362852e2a3a))
 						- 换元的示例
 							- ((648c2de1-d9a7-4760-bb4f-beec4b41102c))
-						-
+							- ((648c488f-85fa-4203-8092-07176b38fce9))
+						- 公式法
+							- ((648c48ac-76be-4848-af0d-1532467c8d68))
 			- LATER 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01