最近我校月考试卷以2011年上海文科压轴题作为最后一题,该题以两个等差数列的通项公式为切入点,研究将两个数列合并后的项从小到大依次排列后构成的新数列的性质,综合考查数列的通项公式、前n项和公式,对考生的分析、解决问题的能力要求比较高,难度很大,学生得分很低.其实对于两数列合并,关键是把握两数列的公共项的组成,只 Recently, my school monthly exam papers to the 2011 Shanghai arts finale as the last question, the title of the two arithmetic progression formulas as the starting point, the study will merge the two series of items from small to large arranged in order The nature of the new series, the comprehensive examination of the sequence of the formula, the first n terms and formulas, the candidates analysis, the ability to solve problems is relatively demanding, difficult, students score low .In fact, the merger of the two numbers, the key is To grasp the composition of the public items in two columns, only