打开App
小学毕业数学题讲解65，求上下山的平均速度，填得很快，结果错了
小升初数学233/248
App01:44
App02:14
App01:59
App01:38
App02:45
App01:36
App02:03
App01:06
App01:56
App01:27
App01:38
App03:06
App01:45
App01:52
App01:45
App01:55
App02:42App01:44App02:14App01:59App01:38App02:45App01:36App02:03App01:06App01:56App01:27App01:38App03:06App01:45App01:52App01:45App01:55App02:42
