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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 7 页: 18 以内的减法练习

第 7 页: 18 以内的减法练习

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https://plus.pelangibooks.com/pluginfile.php/16614/mod_page/content/1/K2%20Maths%20BC%20Book%20A%20P8%20Animation.mp4
 

◄ 第 6 页: 数轴-加法
第 8 页: 竖式减法 ►

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