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50/3=16...2
16*3=48ï¼æå¤ï¼
20/3=6...2
7*3=21ï¼æå°ï¼
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21,21+3=24,24+3=27,27+3=30,30+3=33,33+3=36,36+3=39,39+3=42,42+3=45,48
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