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一年级数学上册第3单元1_5的认识和加减法《第几》同步作业新人教版.doc

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1第几 做一做1.从左数， 排第（ ） ， 排第（ ） 。2.写出 上的数。3.参考答案：1、3 52、5 23、2还可以摆在 1 3 4 5

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