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11月20日作业

2013-11-20 07:38:54| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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加9口诀:减1进1(个位减1,十位进1)

1+9= 2+9=

3+9= 4+9=

6+9= 7+9=

8+9= 9+9=

5+9= (减1进1,个位减1双上9,十位进1)

15+9= 25+9= 35+9=

5+19= (先加十再加9,个位减1双上9,十位进1)

15+19= 25+19= 5+29= 15+59=

11+49= (先加40双下6,再加9减1进1)

32+49= 43+49=

48+39= (先加30双下7,再加9减1进1)

27+39= 39+39=

42+29= (先加20双下8,再加9减1进1)

33+29= 54+29=

49+19= (先加10双下9,再加9减1进1)

41+9= (个位减1,十位进1双下9)

42+9= 43+9= 44+9= 46+9=

47+9= 48+9= 49+9=

重点:个位十位同时动5

45+9= (减1进1,个位减1双上9,十位进1双下9)

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历史上的今天

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