打开App
超长分数计算，利用替代法简化算式后找关键点进行计算
令两组相同的分数组。
小学各类较难简便计算5/21
App02:53
App03:04
App02:49
App02:58
App03:33
App03:14
App01:25
App05:05
App06:01
App01:53
App02:13
App03:17
App04:18
App07:34
App04:21
App02:44
App03:58
App03:01
App01:45
App01:49
App02:01打开App观看
