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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