1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,. 18,19,20. (2) 下列數字中,那一個是合數?請把它圈. 起來:. 41,42,43,44,45,46,47,48,49,50,51,52,53,54,.
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