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K2 数学课本 A (BCBI)

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  8. K2 数学课本 A (BCBI)
  9. 单元 2: 18 以内的加法和减法练习
  10. 第 9 页: 数轴-减法

第 9 页: 数轴-减法

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https://plus.pelangibooks.com/pluginfile.php/16617/mod_page/content/1/K2%20Maths%20BC%20Book%20A%20P9%20Animation.mp4
 

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