chuyên đề hình học lớp 4

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 541 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544 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...  47 ) Cho l giác  ABCDEF. CMR hai tam giác ACE và BDF cùng tr tâm. CHUYÊN ĐỀ BÀI TẬP HÌNH HỌC LỚP 10 ( có sử dụng tài liệu từ các nguồn khác). BIÊN SOẠN : TRẦN MAI SANG 5 48 ) Cho ... src="data:image/png;base 64, 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449 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 541 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 544 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...

Ngày tải lên: 08/06/2014, 11:51

Ngày tải lên: 21/04/2015, 00:15

Ngày tải lên: 15/06/2015, 22:10

... tiêu điểm , độ dài 2 trục của các ELIP sau: a. 4x 2 + 9y 2 = 36 b. x 2 +4y 2 = 64 c. 4x 2 + 9y 2 = 5 d. x 2 + 4y 2 = 1 e. 3x 2 + 4y 2 – 48 = 0 f. x 2 + 5y 2 – 20 = 0 caâu2. Lập phương ... x+3y-3=0 một góc 45 0 2) qua B(-1;2) và tạo với d 2 : 2 3 2 x t y t = +   = −  một góc 60 0 Bài 13: viết ptddt qua A91;2) và cách đều B(2;3) C (4; 5) Phần 3: SỬ DỤNG TÍNH CHẤT HÌNH HỌC TỔNG HỢP ... hằng số - 14 - Bài 3: xét vị trí tương đối của 2 đt 1) 4 2 8 ' & 5 4 3 ' x t x t y t y t = − = +     = + = −   2) 5 1 & 4 0 x t y t x y = +   = − − + − =  Bài 4: cho...

Ngày tải lên: 28/04/2014, 11:48

... giác đều được gọi là hình lăng trụ đều. Hình lăng trụ đứng có đáy là hình bình hành được gọi là hình hộp đứng. Hình hộp đứng có đáy là hình chữ nhật được gọi là hình hộp chữ nhật. Hình hộp ... hộp có tất cả các mặt là hình vuông được gọi là hình lập phương. b. Hình chóp -Hình chóp đều là hình có đáy đáy là đa giác đều và các cạnh bên bằng nhau. 4 CHUYÊN ĐỀ QUAN HỆ VUÔNG GÓC HS: ... ∆ SIO có · 3 42 2 sin 7 7 2 a SO SIO SI a = = = · 0 67 48 'SIO⇒ = Do ∆ SIJ cân nên · · 0 0 0 0 ISN 180 2. 180 2.(67 48 ') 44 24& apos;SIO⇒ = − = − = NI= · 0 7 .sinIS .sin (44 24& apos;) 2 a SI...

Ngày tải lên: 19/08/2014, 20:24

Ngày tải lên: 04/10/2014, 01:23

Ngày tải lên: 02/04/2015, 14:15

Ngày tải lên: 20/09/2012, 17:17

... BC = a. Chøng minh hÖ thøc: 3 3 2 3a b ab+ = Bài 14: Cho hình thang cân ABCD (AB//CD) ngoại tiếp đờng tròn (O;R). Chứng minh hệ thức: 2 . 4AB AC R= Bài 15: Cho tam giác ABC có AB = 2.AC, phân ... Q. a, Chứng minh: 2 4 .BC BP CQ= b, Ngợc lại: chứng minh nếu 2 4 .BC BP CQ= thì đoạ thẳng PQ tiếp xúc với đờng tròn (O) (P thuộc AB, Q thuộc AC) Bài 18: Cho tam giác ABC đều. M là điểm bất kì...

Ngày tải lên: 02/06/2013, 01:26

... cơ bản của hình học lớp 9 , tất cả các tính chất hình học , các hình , các phương pháp giải bài tập đều được tích hợp trong bài toán liên quan đến đường tròn . Chính vì thế khi dạy và học đến phần ... hình là hình gì ? ( có thể là tam giác cân , hình bình hành , hình thoi , hình chữ nhật , hình thang cân …) . Lưu ý : Khi chứng minh tứ giác là hình thang cân không được chứng minh là hình thang ... tổng hợp các kiến thức của các lớp 6 , 7 , 8 . Phần hình học là một phần của bộ môn Toán mà đa số học sinh rất ngại học phần này vì từ kiến thức đến bài tập khó học và khó tìm ra lời giải . “Đường...

Ngày tải lên: 25/06/2013, 01:27

... tự là hình đói xứng của H qua các đơng thẳng AB, AC. Chứng minh rằng: a) Ba điểm D, A, E thẳng hàng. b) Tứ giác BCED là hình thang vuông. c) DHE = 90 0 . d) DE = 2AH. (Để học tốt hình học 8) V. ... vậy giúp ta đến với các bài toán hay và khó sau: Bài 1 .4: Cho hình bình hành ABCD. Qua A vẽ đờng thẳng xy chỉ có một điểm chung A với hình bình hành. Gọi BB', CC', DD' là các ... AE = CF. Bài 1.3: Cho hình bình hành ABCD. Lấy các điểm E, F lần lợt trên các cạnh AB, DC sao cho AE = CF. Chứng minh rằng các đờng thẳng AC, BD, EF đồng quy. Bài 1 .4: Cho hình bình hành ABCD....

Ngày tải lên: 29/06/2013, 01:27

... đường là hình (7 chữ cái) hình (7 chữ cái) c h u n h a t2 Hình chữ nhật có đầy đủ Hình chữ nhật có đầy đủ các tính chất của hình các tính chất của hình bình hành và hình bình hành và hình (8chữ ... chữ cái) 4 i H P hN nu o Kết quả n G O g A a I P t g o 4 góc vuông 1 góc vuông 1 góc vuông Tứ giác (2) (1) (3) Hình bình hành Hình thang cân Hình chữ nhật 3 góc vuông Vẽ hình chữ ... vuông 2. Hình thang cân có một góc vuông là hình chữ nhật. 1. Tứ giác có ba góc vuông là hình chữ nhật. Dấu hiệu nhận biết hình chữ nhật: Dấu hiệu nhận biết hình chữ nhật: 3. Hình bình hành...

Ngày tải lên: 07/07/2013, 01:26