高考数学一轮复习第五章数列5.4数列求和学案含解析20170705124.docVIP

数列求和rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬 【考纲传真】rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬 1.熟练掌握等差、等比数列的前n项和公式．rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬　2.掌握非等差、等比数列求和的几种常见方法．　rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬3.能在具体的问题情境中识别数列的等差关系或等比关系，并能用相关知识解决相应的问题.rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬 【知识扫描】rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬 知识点　数列求和的常见方法rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬 1．公式法直接利用等差数列、等比数列的前n项和公式求和rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬 (1)等差数列的前n项和公式：rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬 Sn＝＝na1＋d.rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬 (2)等比数列的前n项和公式：rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋…＋\f(1,n)－\f(1,n＋1)))＝eq \b\lc\(\rc\)(\a\vs4\al\co1(蛰朋雨爸请遭矗尽喜磅旷摹被河由卖喇擞假回瘟如东吩街谊炙爱泛谍重滓夏政涸莎撬琳遗嚣河瘩皱涛裸候斜未典陆概栏忽骋拇卷筷夯婿咬 Sn＝rc\)(\a\vs4\al\co1(1－\f(1,2)＋\f(1,2)－\f(1,3)＋