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数学课堂

2012-03-19 17:30:12| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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今日学习整十减法，左手负责十位档，进行减法。

习题：20-10=

30-20=

40-30=

60-50=

70-60=

90-70=

90-80=

90-40=

明日学习整十加法，可用算盘提前进行预习。

习题：10+10=

20+20=

10+30=

50+40=

20+50=

30+60=

10+70=

10+80=

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历史上的今天

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