巢湖学院学报 ›› 2019, Vol. 21 ›› Issue (6): 65-69.doi: 10.12152/j.issn.1672-2868.2019.06.009
1.皖西学院金融与数学学院,安徽六安237012;2.安徽教育出版社,安徽合肥230601
1.School of Applied Mathematics, West Anhui University, Lu’an Anhui 237012;2. Anhui Education Press, Hefei Anhui 230601