找规律填数 15 ,21,18,19,21,17 (),()

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找规律填数15,21,18,19,21,17(),()找规律填数15,21,18,19,21,17(),()找规律填数15,21,18,19,21,17(),()241515,18,21,(24)21

找规律填数 15 ,21,18,19,21,17 (),()
找规律填数 15 ,21,18,19,21,17 (),()

找规律填数 15 ,21,18,19,21,17 (),()
24 15 15,18,21,(24) 21,19,17,(15)

15,21,18,19,21,17,(18),(19).