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一年级数学上册第3单元1_5的认识和加减法《分与合》作业新人教版.docx

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1分与合1.填一填，背一背。2 的分成：3 的分成：4 的分成：5 的分成：2.利用数的组成做加法。1+1=21+2= 2+1=1+3= 2+2= 3+1=1+4= 2+3= 3+2= 4+1=3参考答案1.1 1； 1 2 2 1 ；1 3 2 2 3 1； 1 4 2 3 3 2 4 12.2 2 ；3 3 3 3 ；4 4 4 4 4 4 ；5 5 5 5 5 5 5 5。

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