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一年级20以内进位加和退位减，要不要识记呢？大家留言来讨论吧
乘法的计算，用乘法口诀，乘法口诀,就是要求学生识记的， 一年级20以内进位加和退位减，要不要识记呢？ 大家在评论区留言来讨论吧！
一年级数学下册221/416
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