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二项式定理问题是高考常考内容,题型较多,解法也灵活多样.本文就2013年高考题涉及到的有关问题分类解析,以便考生对这部分知识的考点、题型有所了解,使得复习备考更有针对性.一、求展开式中的常数项这类问题在考题中最为常见,只要利用二项展开式的通项T r+n=Cr n an-rbr,令该项各字母的指数均为零即可.例1(1)(江西卷5题)展开式(x2-2/x3)5的常数项为
Binomial theorem problem is the college entrance examination often test content, more questions, the solution is also flexible and diverse.This article on the 2013 college entrance examination questions related to classification analysis, in order to test the knowledge of this part of the test, the type of understanding, Make the preparation for the examination more pertinent.First, find the constant items in the expansion of the type of questions in the examination of the most common, as long as the use of two expansion of the general term T r + n = Cr n an-rbr, so that each Letters of the alphabet are zero .Example 1 (1) (Jiangxi Volume 5) Expansion (x2-2 / x3) 5 constant term is