About author:ZHANG Xiao-yan(1979-), female, native of Huangshi, Hubei, an associate professor of Hubei
Polytechnic University, engages in algebra coding.
Supported by:
Supported by the Scientific Research Foundation of Education Department of Hubei Province(B2013069); Supported by the National Science Foundation of Hubei Polytechnic University of China(12xjz14A,11yjz37B);