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一个数加上9，减去9，再乘以9，除以9后，还得9。这个数是多少？
图示法解决还原问题的基本思维方式。
三年级合集9/15
App01:02
App01:20
App02:46
App01:27
App01:04
App01:00
App01:00
App01:03
App01:18
App01:16
App01:39
App01:41
App01:25
App01:43
App01:26打开App观看
图示法解决还原问题的基本思维方式。
App01:02App01:20App02:46App01:27App01:04App01:00App01:00App01:03App01:18App01:16App01:39App01:41App01:25App01:43App01:26
