https://padlet.com/15063662/algebra 学习进度记录 en-us 2021-01-15 14:22:54 UTC 2021-01-15 16:16:42 UTC hello@padlet.com https://padlet.net/icons/png/1f468-1f393.png 15063662 https://padlet.com/15063662/algebra/wish/1091287842 开始阅读第一章]]> 2021-01-15 14:25:46 UTC https://padlet.com/15063662/algebra/wish/1091287842