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§1 数列的通项与前项的和一、选择题 1.数列{a_n)的前项的和S_n=2n~2+5n-2,则该数列必定是( ) (A)等差数列 (B)等比数列 (C)递增数列 (D)递减数列 2.设x∈N,log_2x的整数部分用
§1 The general term of the series and the sum of the preceding terms. The multiple choice question 1. The sum of the preceding terms of the series {a_n)=Sn=2n~2+5n-2, then the series must be () (A) the arithmetic progression ( B) Comparing sequence (C) Increasing sequence (D) Decreasing sequence 2. Set the integral part of x∈N, log_2x