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83、75、67、59、
51
51
分析:83-75=8;75-67=8;67-59=8;前一个数比后一个数多8.
解答:解:59-8=51;
要填的数是51.
故答案为:51.
点评:解决本题关键是找出相邻两个数的差是8这一规律,并由此求解.
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