找规律,填数字:seventeen,fifteen,thirteen

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找规律,填数字:seventeen,fifteen,thirteen

找规律,填数字:seventeen,fifteen,thirteen
找规律,填数字:seventeen,fifteen,thirteen

找规律,填数字:seventeen,fifteen,thirteen
17,15,13
是递减的等差数列,d=2

( nineteen ),seventeen,fifteen,thirteen,( eleven)

翻译成汉语为17,15,13.依次减去2,所以下一个为11,用英语为eleven,接下来为nine,seven,five,……