小学数学:抓住不变量统一份数;甲、乙的比是2:3,乙给甲18,甲、乙的比变为5:3,原来甲、乙各多少?
App03:05
App03:03
App02:03
App02:33
App02:03
App02:53
App03:07
App02:36
App03:02
App01:52
App02:26
App02:06
App02:32
App03:52
App03:17
App03:25
App02:17
App02:17
App02:28
App02:04
App02:31
App03:02
App02:48
App02:21
App02:05
App02:56
App02:16
App01:47
App01:42
App02:08
App03:03