diff --git a/题库0.3/BasicKnowledge.json b/题库0.3/BasicKnowledge.json
index aa37e1a7..338b55d7 100644
--- a/题库0.3/BasicKnowledge.json
+++ b/题库0.3/BasicKnowledge.json
@@ -830,7 +830,7 @@
             "K0405002X",
             "K0405003X"
         ],
-        "content": "以$a$为首项,$q$为公比的等比数列, 其前$n$项和为$S_n$, 当公比\\blank{90}时, 有$\\displaystyle\\sum_{i=1}^{+\\infty}aq^{i-1}=\\displaystyle\\lim_{n \\to +\\infty}S_n=$\\blank{90}."
+        "content": "以$a$为首项, $q$为公比的等比数列, 其前$n$项和为$S_n$, 当公比\\blank{90}时, 有$\\displaystyle\\sum_{i=1}^{+\\infty}aq^{i-1}=\\displaystyle\\lim_{n \\to +\\infty}S_n=$\\blank{90}."
     },
     "B00117": {
         "lesson": "K0406",