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贵刊89年第10期“基础训练及解答”一文“练习五”中第1大题第16小题(选择题) “一个等差数列共2n+1项,其中奇数项之和为305,偶数项之和为276,则第n+1项为(
Your first issue of “Basic Training and Answers” in the “Basic Training and Answering” article of the 89th issue of your book “Exercise 5” is the 1st topic of the 16th (multiple-choice questions) "A series of arithmetic errors has a total of 2n+1 terms, in which the sum of the odd entries is 305. If the sum of even items is 276, then the n+1 item is (