三级等差数列 16,16,17,24,42,(

七月四号2022-10-04 11:39:541条回答

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my17bt_op3 共回答了19个问题 | 采纳率94.7%
本题为三级等差数列,是数列题目中的基本题型,相应的,两两连续做差也是解决数列题目的一种基本方法.原数列:16 16 17 24 42 (76)做一次差: 0 1 7 18 (34) 做两次差: 1 6 11 (16) 为公差为5的等差数列故推知答案为76
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