7和8的分解组成课件.ppt

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7和8的分解组成,1,7,2,3,4,5,6,7,8,9,7,1,2,3,4,5,6,6,5,4,3,2,1,10,8,11,12,13,14,15,16,17,18,8,1,2,3,4,5,6,7,6,5,4,3,2,7,1,19,7,2,5,7,7,3,4,6,1,8,8,8,4,2,5,4,6,3,20,谢谢大家,21,