人教三年级课后练习

一一

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     长=周长÷2-宽

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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