免费下载原创《求未知加数》ppt课件(一年级上册新苏教版数学)
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开火车,算一算

3 + 4 = 5 + 5 = 7 + 3 = 7 – 2 = 5 + 4 = 6 + 3 = 4 + 4 = 3 + 7 = 8 – 6 = 6 + 4 = 8 – 5 = 10 – 5 = 5 + 5 = 10 – 6 = 8 + 2 = 7 + 2 = 5 + 3 = 10 – 3 = 10 – 1 = 2 + 7 =

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