The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022 The three schools in southern Jiangsu will investigate mathematics in the second semester of the second semester of the third year of high school in 2021-2022