等比数列求和公式课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,2.4.2,等比数列的求和公式,(第一课时),1,2.4.2 1,新课讲解,2,新课讲解2,公式理解,3,公式理解3,4,4,5,5,例题讲解,6,例题讲解6,7,7,8,8,9,9,跟踪练习,10,跟踪练习10,11,11,12,12,13,13,14,14,例题讲解,15,例题讲解15,16,16,17,17,跟踪练习,18,跟踪练习18,19,19,2. 已知数列b,n,前n项和为S,n,，且b,n,=2-2sn,数列a,n,是等差数列,a,5,= , a,7,= .,(1)求b,n,的通向公式。,(2) 若c,n,=a,n,.b,n,n=1,2,3.求；数列c,n,前n项和T,n,20,2. 已知数列bn前n项和为Sn，且bn=2-2sn,2,例题讲解,21,例题讲解21,跟踪练习,22,跟踪练习22,23,23,例题讲解,24,例题讲解24,25,25,26,26,27,27,跟踪练习,28,跟踪练习28,29,29,30,30,31,31,32,32,33,33,34,34,知识总结,35,知识总结35,36,36,随堂练习,37,随堂练习37,38,38,答案：,D,39,答案：D 39,40,40,41,41,42,42,43,43,2.4.2,等比数列的求和公式,(第二课时),44,2.4.2 44,新课讲解,45,新课讲解45,46,46,47,47,深化理解,48,深化理解48,49,49,50,50,例题讲解,51,例题讲解51,52,52,53,53,54,54,答案,A,55,答案A 55,跟踪练习,56,跟踪练习56,57,57,答案：,B,58,答案：B 58,59,59,60,60,跟踪练习,61,跟踪练习61,62,62,63,63,64,64,65,65,66,66,跟踪练习,67,跟踪练习67,答案：,A,68,答案：A 68,例题讲解,69,例题讲解69,70,70,71,71,跟踪练习,72,跟踪练习72,73,73,74,74,75,75,76,76,77,77,78,78,79,79,80,80,81,81,82,82,随堂练习,83,随堂练习83,答案：,B,84,答案：B 84,85,85,答案：,A,86,答案：A 86,答案：,3,87,答案：3 87,答案：,8,88,答案：8 88,答案：,192,89,答案：192 89,90,90,91,91,92,92,