学生用户可领69-20个护券，
https://item.jd.com/https://prodev.m.jd.com/mall/active/34fyJhzURQKz7U9YWPyHWShSHLMF/index.html?_ts=1595246931301&ad_od=share&utm_user=plusmember&cu=true&utm_source=u.jd.com&utm_medium=jingfen&utm_campaign=t_2011410883_&utm_term=2c11bc4e9c9f496ba85c808a434b1d57.html
有3件5折区，
https://item.jd.com/https://v.m.jd.com/landpage/promotionList.action?activityId=50108909970&promotiontitle=%e9%99%90%e6%97%b6%e4%bf%83%e9%94%80%ef%bc%9a%e6%bb%a13%e4%bb%b6%ef%bc%8c%e6%80%bb%e4%bb%b7%e6%89%935%e6%8a%98&ad_od=share&utm_user=plusmember&cu=true&utm_source=u.jd.com&utm_medium=jingfen&utm_campaign=t_2011410883_&utm_term=5e97e8fe1b3a4711a01396db33a60fba.html
找可用69-20券的凑满69，付14.5+u
