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... ibelieveicanfly@ymail.com Trần Duy Sơn Xuân kỷ sửu 2009 Đi tìm công thức tổng quát dãy số Trần Duy Sơn 3 ______________________________________________________________________________ The love makes ... Giải: Giả sử: (2). n n u v an b   Thay vào dãy đã cho ta được: 1 2( ( 1) ) 1, n n v an b v a n b n          chọn ,a b sao cho 2 ( 1) 2 1 ( 2) 1 0 ( ) n an b a n b n a n b n v   ... thế lượng giác, liên tưởng tới công thức To be continue… 16 The love makes us stronger Đi tìm công thức tổng quát dãy số Trần Duy Sơn 17 The love makes us stronger Đi tìm công thức tổng quát

Ngày tải lên: 14/05/2015, 23:00

... B = 23x5  53x8 8x 311? ? ?113 x14 Cách giải: B = 14 11 11 14 11 8 11 5 2 x x x x        B = 25x5  22x5  58x8  55x8  811x11 8x 811? ? ?111 4x14  111 1x14 = 14 11 11 8 5        ... < 2889 nên trang cuối phải có chữ số Số chữ số để đánh số trang có chữ số la: 600 - 189 = 411 (chữ số) Số trang có chữ số 411: = 137 trang Vậy sách có tất là: 99 + 137 = 236 trang Bài toán ... : 110 = 11 x 10 Số hạng thứ : 99 = 11 x Số hạng thứ : 88 = 11 x Số hạng thứ : 77 = 11 x ……… Từ ta suy luận quy luật dãy số là: Mỗi số hạng số thứ tự số hạng nhân với 11 Vậy số hạng dãy : x 11

Ngày tải lên: 20/12/2020, 05:49

... nhân, ta có d = ? ?11 d =4 Giải phương trình ta 18, 7, − d = ? ?11 F = 389 Với , cấp số cộng Lúc Trang 77 Giaovienvietnam.com Với d =4 , cấp số cộng 3, 7 ,11 Lúc F = 179 Trang 78 ... π 2k +2 π 2k +1 nên theo giả thiết quy nạp ta có π π  π  π π + cos k +1 = + cos  k + ÷ = cos k + Tk +1 = 2.2 cos k + = cos k + 2 2   Mặt khác, nên Vậy phương án B STUDY TIP Ngoài cách ... đây: 511? ? Tn = sin Tn = + + + + n n 1024 Đặt (có dấu căn) Tìm để n = 10 n =8 n=9 n = 11 A B C D Trang Câu Cho dãy số ( un ) số là: ( un ) un = 2sin A un = cos C Ví dụ Đặt Giaovienvietnam.com

Ngày tải lên: 07/06/2022, 19:19

... 0, a1,a 2, , a11 diện tích mặt đế tháp, tầng 1, tầng 2,., tầng 11 n 1 Khi ta có: a  12288; an  an 1  a   , n  1, 2, ,11   11 11 1 1 Diện tích mặt tầng là: a11  a   ... Cho dãy số  an  xác định a1  , an 1   2an , n  , n   Tính tổng 10 số hạng dãy số 2050 A B 2046 C 682 D 2046 Lời giải Vì an? ??1 a   2 suy  an  cấp số nhân với  an q  2 Suy ... dãy số  an  xác định a1  5, an 1  q .an  với n  , q số, q  , q  Biết công thức số hạng tổng quát dãy số viết dạng an   q n 1    q n 1 1 q Tính   2 ? A 13 B C 11 Lời giải

Ngày tải lên: 13/12/2022, 22:13

... than fly a would have - would drive b had - had driven c had - would drive d would have had - would drive 17 I _ you sooner had someone told me you were in the hospital a would have ... organizations have put forward several recommendations to alleviate the problem of overpopulation, including an increase in food production, general economic development in target areas, and ... overpopulation? a Famine and epidemic b Economic development and a decline in birth rate c Medical advance and improved agricultural methods d Conservation of available resources 45 Which of

Ngày tải lên: 27/12/2020, 07:30

... in sports competitions a Judge b Sportman c Athletic d Sponsor 10 They quickly read the questions and tried to find out the answers a complete b guess c offer d discover 11 A string ... schools to attract students a competence b competition c competitive d competitor 13 Such questions provide a useful means of students' interest a expressing b encouraging c stimulating ... d - that best completes the sentence. 16 We took part in a sponsored walk to support the poor a organized b organizing c that organized d had organized 17 We strongly recommend your

Ngày tải lên: 27/12/2020, 07:32

... https://vndoc.com/tieng-anh -lop- 11 Bài tập Tiếng Anh lớp 11 nâng cao: https://vndoc.com/tieng-anh-pho-thong -lop- 11 https://vndoc.com/ 024 2242 6188 Bài tập Tiếng Anh lớp 11 Unit 10: Nature in Danger ... Tiếng Anh lớp 11 Unit 10: Nature in Danger có đáp án - Số 1 Bài tập Tiếng Anh lớp 11 Unit 10: Nature in Danger có đáp án - Số 2 Anh lớp 11 o: https://vndoc.com/tieng-anh-pho-thong -lop- 11 11: https://vndoc.com/test/mon-tieng-anh -lop- 11 ... or groups of sentences by means of relative pronouns, making any changes necessary. 1 Her many friends gave her encouragement I like to be considered among them Her many friends 2 Her father

Ngày tải lên: 21/01/2021, 05:10

... (leave) for the holiday " Aston United (8) (appoint) Ronson as manager two years ago and last season they (9) (finish) second in the First Division However, they (10) (win) only five matches ... to-infinitive or an - ing form of a verb. 1 'You'd better look for a new job, Andrew.' Jane advised 2 'It was nice of you to invite me to your birthday party Thanks very much.' Mike thanked ... please? can't understand,' he said to me (6)10 'I'm sorry didn't phone you earlier I was very busy,' Jill said to me 11 'It's not true! I have never been arrested!' Larry said 12 'Why not decorate

Ngày tải lên: 19/02/2021, 22:01

... https://vndoc.com/tieng-anh -lop- 11 Bài tập Tiếng Anh lớp 11 nâng cao: https://vndoc.com/tieng-anh-pho-thong -lop- 11 Anh lớp 11 o: https://vndoc.com/tieng-anh-pho-thong -lop- 11 11: https://vndoc.com/test/mon-tieng-anh -lop- 11 ... than they towards children a human b humane c humanized d humanistic 11 aren't effective anymore because insects have become resistant to them a Fertilizers b Pesticides c Herbicides d Composts ... Vindictive d Concerned IV WRITING A From the four words or phrases A, B, C or D - choose the one that best completes the sentence. 56 The soybean, a plant native to China and Japan, has become

Ngày tải lên: 04/03/2021, 09:31

... Tiếng Anh lớp 11 đây: Bài tập Tiếng Anh lớp 11 theo Unit: https://vndoc.com/tieng-anh -lop- 11 Bài tập Tiếng Anh lớp 11 nâng cao: https://vndoc.com/tieng-anh-pho-thong -lop- 11 Anh lớp 11 o: ... been changed a lot because of the invention of the computer C the World Wide Web and e-mail communication have affected modern life D there have been developments in telecomunications 44 According ... access to a computer whilst today most people use them at work, home or school and use of e-mail and the Internet is an every day event (7)World Wide Web means that information on every conceivable

Ngày tải lên: 04/03/2021, 09:44

... Bài tập Tiếng Anh lớp 11 theo Unit: https://vndoc.com/tieng-anh -lop- 11 Bài tập Tiếng Anh lớp 11 nâng cao: https://vndoc.com/tieng-anh-pho-thong -lop- 11 Anh 11: ... Jane asked Mike to make her some coffee b Jane wanted to know whether Mike like coffee c Jane offered to make some coffee for Mike d Jane suggested drinking coffee 55 'Could you please wait here ... Summer and the Winter Games b The games can't last longer than 16 days c The Summer Games have more sporting events than the Winter Games d The Olympic flag has five rings of five different colors

Ngày tải lên: 04/03/2021, 09:59

... century, and has continued to be popular throughout China up to the present day On this festive night, many cities(42)………lantern fairs to display many exotic and sometimes weirdly shaped multi-colored ... đọc tham khảo thêm tài liệu Tiếng Anh lớp 11 tại đây: Bài tập Tiếng Anh lớp 11 theo từng Unit: https://vndoc.com/tieng-anh -lop- 11 (20) Anh Unit: o: 11: ... birthday party Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions With increasing development and use of computer

Ngày tải lên: 27/12/2020, 07:28

... non- renewable, and many are in danger of pollution As a consequence, resources must be conserved and the environment protected Conservation must become an important part of everyone’s life ... pollution As a consequence, resources must be conserved and the environment protected Conservation must become an important part of everyone’s life Question 31 How many kinds of resources are mentioned ... earth may be dangerous If humans continue to pollute the air, it will not contain the correct amounts of these gases Many resources are limited and non- renewable, and many are in danger of pollution

Ngày tải lên: 28/12/2020, 09:39

... tan rã nhanh chóng. Qn ta chống cự liệt, Pháp chuyển sang kế hoạch đánh lâu dài, đánh chếm VN bước  Triều đình khơng biết tận dụng thời đánh Pháp thắng Pháp + Giữa lúc tiến thoái lưỡng nan ... chuyển sang giai đoạn Đế quốc chủ nghĩa, nên riết xâm lược Việt Nam để tranh giành ảnh hưởng với Anh khu vực Châu Á (0,75 điểm) - Năm 1867 Napoleong II lập Hội đồng Nam kì để tìm cách can thiệp ... 4 ĐỀ THI GIỮA HỌC KỲ II MÔN: SỬ 11 Thời gian: 45phút Câu 1: Thực dân Pháp đánh chiếm Bắc Kì lần thứ sao? Phong trào kháng chiến ở (11) Câu 2: Kết cục chiến tranh giới thứ hai Chứng minh vai

Ngày tải lên: 30/12/2020, 22:49

... scope of your research It can be even more helpful to 9………existing research and ask yourself if there are any controversies Perhaps there is a 10………… that you may want to challenge and this could ... further and very important factor to take into account is your own 11? ??…… resources If these are limited then you need to avoid choosing a study that will involve costly equipment or surveys However, ... While many nations could end up with milder climates, the change — perhaps 100 times faster than at any time in human history - could be so drastic that many of the benefits would be lost There could

Ngày tải lên: 30/12/2020, 23:00

... If everything is all right, we ……… our work on time. A complete B will complete C have completed D are completing Câu 14: In tonight’s quiz, our contestants have come from all over the country. ... Câu 6: If everything is all right, we ……… our work on time. A complete B will complete C have completed D are completing Câu 7: Johnny will have completed his five- year course at university next ... him some money. B Peter wishes not to lend him some money. C Peter thanked him for lending him some money. D Peter regretted lending him some money. (3)A complete B are completing C have completed

Ngày tải lên: 17/02/2021, 14:38

... Combine the following sentences, using suitable relative pronouns. I have a class It begins at am (11) 3 My sister asked me a question I couldn't answer it A lion is an animal This animal lives ... Asian countries after World War II? 5 Why did many new independent Asian countries want to use a new type of competition? 6 Who greatly contributed to holding the first Asian Games? 7 Which country ... Adulyadej Thai dancers graced the stage as to have an overview of what the athletes can expect as Thailand will host the 24th Southeast (17)1 Which country will host the 24th Southeast Asian Games?

Ngày tải lên: 04/03/2021, 18:28

... twenty-fifthwedding anniversary It's Jane's farewell party _ Friday night 3 He blew _ all 60 candles _ his birthday cake We don't know what to give Dad _ Christmas 5 People usually give cards and ... the plans 10 You'd better _ (go) and see the boss and say what you 've done If you put off _ (explain) it to her, she'll only more annoyed 11 No that's not what I meant (say) How can I ... for Americans Americans aren't _ (11) When you go to the party in Atlantica, don't bring a gift If you so, our hosts will believe that you think they are poor Never arrive on time

Ngày tải lên: 11/03/2021, 01:35

... industrialisation changing the world rapidly, there were many sites that needed to be saved Eventually, UNESCO formed the World Heritage Organisation to protect important natural and historic sites wherever ... A UNESCO B UNESCO to succeed C UNESCO to develop D UNESCO to rescue 39 The word “this” in paragraph refers to . A culture B decision C country D economics 40 What is meant by ... business and production are changing the world VIII WRITING 1 For each question, complete the new sentence so that it means the same as the given one using NO MORE THAN FIVE WORDS. An example

Ngày tải lên: 28/12/2020, 09:37

... sea levels put this group of islands in imminent danger Much of the Vanuatuland mass lies just a few feet above the waves If sea levels continue to rise at current rates, the inhabitants of Vanuatu ... Mount Tabwemasana, at 1879 m There are several active volcanoes in Vanuatu, including Lopevi as well as several underwater ones The future for Vanuatu is very uncertain Global warming and the threat ... person achieve faster weight loss than the high paced exercises Another reason to exercise is it boosts energy, and improves moods Several studies have shown that daily exercise helps improve

Ngày tải lên: 28/12/2020, 09:38