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2013年湖北省高一数学联合竞赛于5月12举行,试题共有10道填空题和3道解答题,该试题难度适中,侧重考察基础和能力,第10题和第13题难度稍大.一、填空题例1设集合A={1,3,5,7,9},B={2,4,6,18},若C={a+b|a∈A,b∈B},则集合C的所有元素之和为.解析:本题主要考察集合的概念,集合的性质,数列求和.由题设可得C={3,5,7,9,11,13,15,19,21,23,25,27},集合C
In 2013, the joint competition for high mathematics in Hubei Province was held on May 12, and there were 10 fill-in-blank questions and 3 answer-questions in the questions. The questions are modest and focus on the basis and abilities. Questions 10 and 13 are somewhat more difficult. , Fill in the blank example 1 set A = {1,3,5,7,9}, B = {2,4,6,18}, if C = {a + b | a∈A, b∈B} Then the sum of all the elements in set C is A. Analysis: This question mainly examines the concept of set, the nature of set, and the summation of series.We can get C = {3,5,7,9,11,13,15,19 , 21,23,25,27}, set C