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标题: 人教三年级课后练习 [打印本页]

作者: 一一    时间: 2012-4-25 12:50
标题: 人教三年级课后练习
本帖最后由 一一 于 2012-4-25 12:54 编辑

第一单元    毫米的认识
知识要点:
长度单位、单位之间的进率、单位之间的换算
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    第二单元   四边形的认识
知识点:
四边形:四条直的边  四个角
长方形:对边相等  四个直角
正方形:四边相等  四个直角
长方形周长:(长+宽)×2     =周长÷2-
正方形周长:边长×4  边长=周长÷4
正方形周长是边长的4倍    边长是周长的四分之一
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第七单元
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作者: sosxiao    时间: 2012-6-7 13:39





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