(Provincial Award-winning Teaching Plan) Reflection and reference
2024-09-12 11:10
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((Provincial Award-winning Teaching Plan) Reflection)(Excellent)19 Master Shaving
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2024-09-12 10:55
The master hairdresser was a fictional character that usually appeared in novels, movies, television dramas, and other literary works. A master hairdresser was usually a highly skilled hairdresser who could...
Earth in the Universe (Provincial Award-winning Teaching Plan)
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2024-09-13 17:53
The Earth in the universe referred to the state of existence of the Earth in the universe. At present, scientists still have many unknowns and unsolved mysteries about Earth in...
2 Rain Lane (Provincial Award-winning Teaching Plan)1
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2024-09-12 08:34
Rainy alleys were a famous literary theme and a common scene in many novels and movies. It usually depicted a gloomy, rainy night and a lonely, sad person. In the...
(Provincial Award-winning Teaching Plan) Thousand People Cake
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2024-09-12 11:07
The Thousand Person Cake was a traditional Chinese pastry made from glutinous rice flour, sugar, bean paste, and other ingredients. It was shaped like a flat cake, with a golden...
[Education of Humanity]: Polar Region (Provincial Award-winning Teaching Plan)(1)
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2024-09-13 18:15
Greetings, respected teacher!
I would like to ask if you can give me some guidance on the provincial award-winning teaching plan for Polar Regions? Thank you!
3 Memories of Mr. Lu Xun (Provincial Award Winning Teaching Plan)1
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2024-09-13 17:35
Lu Xun was one of the founders of modern Chinese literature. His works deeply reflected the darkness of society and the sufferings of the people at that time, which had...
High school geography. 3 Natural resources and human activities (provincial award-winning teaching plan)
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2024-09-13 17:38
High school geography 3 natural resources and human activities (provincial award-winning teaching plan) Natural resources are the foundation of human survival and development, and also an important support for human...
How to choose the award winning essay teaching plan
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2024-09-19 13:00
The following points should be noted in the selection of award-winning essay teaching plans: 1. Decide on the theme: First, you must determine an attractive theme that can arouse the...
5. Kong Yiji's Open Class Award-winning Teaching Plan
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2024-09-10 15:18
Kong Yiji was a famous character in the novel Kong Yiji and one of the villains in the novel. The award-winning teaching plan for the public class was a plot...
High school mathematics compulsory 5 open class (provincial award-winning teaching plan)2 the basic nature of the geometric series and its application
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2024-09-12 08:33
高中数学必修5公开课(省级获奖教案)2 等比数列的基本性质及其应用
(一)等比数列的定义
设公比为$r$首项为$a_1$则等比数列的通项公式为$a_n=a_1r^{n-1}$。
(二)等比数列的性质
1 等比数列的公比为任意非负整数且不等于1。
2 等比数列的任意相邻两项的和都是等比数列。
3 等比数列的首项、公比、公差均不为零。
4 等比数列的通项公式为$a_n=a_1r^{n-1}$。
(三)等比数列的应用
1 求等比数列的前n项和公式:$S_n=a_1+a_1r+a_1r^2+\cdots+a_1r^{n-1}$
2 求等比数列的通项公式公式:$a_n=a_1r^{n-1}$
3 求等比数列的公比:$r=\frac{a_2}{a_1}$
4 求等比数列的首项:$a_1$
5 求等比数列的前n项和公式:$S_n=\frac{a_1(r^n-1)}{r-1}$
6 求等比数列的通项公式公式:$a_n=a_1r^{n-1}$
7 求等比数列的公比:$r=\frac{a_3}{a_2}$
8 求等比数列的首项:$a_2$
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