Update index.tsx

src/teacher/piano-room/class-arrangement/create-class/index.tsx

@@ -181,10 +181,7 @@ export default defineComponent({
             data: {
               classNum: classInfo.classNum, //课时数
               consumeTime: Math.ceil(
-                n *
-                  (n - 1) *
-                  classInfo.classNum *
-                  parseInt(classInfo.singleClassTime)
+                n * classInfo.classNum * parseInt(classInfo.singleClassTime)
               ), //消耗时长
               courseName: classInfo.courseName, //课程名称
               singleClssTime: classInfo.singleClassTime, //单课时长