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西南师大2011课标版《分数的意义》新课标PPT课件优质课下载
5个“1”是5
把 看着单位“1”
6个“1”是6
1米
把 看着单位“1”
···5
················3
·······························1
······························
把 看着单位“1”
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····························( )
4
1
把 看着单位“1”
1米
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···························( )
3
1
把 看着单位“1”
····················( )
·······( )