http://reply.papertrans.cn/2/129/12865/12865-31.png
Submitted on: 30 April 2020.
Revised on: 22 July 2020.
Accepted on: 05 September 2020.
___________________International Electronic Journal of Mathematics Education
http://reply.papertrans.cn/2/129/12865/12865-33.png
Submitted on: 06 January 2015.
Revised on: 28 March 2015.
Accepted on: 18 April 2015.
___________________International Electronic Journal of Mathematics Education
http://reply.papertrans.cn/2/129/12865/12865-35.png
Submitted on: 30 November 2018.
Revised on: 08 January 2019.
Accepted on: 24 February 2019.
___________________International Electronic Journal of Mathematics Education