打开App
这道题要明白，为什么两个式子的结果不可能互为相反数
七年级上册数学30/72
App02:49
App03:42
App04:11
App02:19
App04:48
App04:53
App02:01
App02:37
App06:12
App01:48
App01:12
App03:17
App05:09
App05:17
App05:21
App06:12
App02:25
App03:10
App04:15
App07:42
App04:40
App05:15
App06:54
App03:02
App03:34
App02:56
App03:35
App04:21
App03:08
App07:47
App03:47打开App观看
