diff --git a/题库0.3/LessonObj.json b/题库0.3/LessonObj.json
index 2f89aca4..02dc65fc 100644
--- a/题库0.3/LessonObj.json
+++ b/题库0.3/LessonObj.json
@@ -4032,7 +4032,7 @@
     "K0826002X": {
         "id": "K0826002X",
         "unit_obj": "D08005X",
-        "content": "经历推导方差的第二个计算公式$D[X]=\\mathrm{E}(X^2)-(E[X])^2$的过程."
+        "content": "经历推导方差的第二个计算公式$D[X]=E[X^2]-(E[X])^2$的过程."
     },
     "K0826003X": {
         "id": "K0826003X",