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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cFBdwFiprlWrVl27dk1vlcrtV24tWrSop6cnhNDY2Hjw4MFYLGZioLqAMVFd+Xz+3Llzemt4WNcFqgsYu9XFcDp27NicOXP0FqguQHUBqC5g1HNGIAAA1QUAoLoAAFBdAACqCwBAdQEAoLoAAFQXAACqCwBAdQEAqC4AAFQXAIDqAgBAdQEAqC4AANUFAIDqAgBQXQAAqgsAANUFAKC6AABQXQAAqgsAQHUBAKC6AABUFwAAqgsAQHUBAKguAABUFwCA6gIAQHUBAKguAADVBQCA6gIAUF0AAKoLAADVBQAwmkWNAADGgkwm09HRccdvmz59ekNDg3ENclyLFy9OJBKqCwD4qddee2337t13/LbGxkbVFUJ48cUX0+n0Hb/t8OHDg6+uSKFQMFmA4RSJREII3n5LqKmpacDthw4dymQymzdvbm5unjp16hifUn19/WOPPVYoFObNm3f77yzf7q62trY333zzpo1vvPHGG2+8sWzZsj179ixdurRy/j/9nd/5nQcffLCmpub23zn43V32dQFQzRKJxLJlyyRXLpfr7Oz84he/+PTTT98xI4bf5MmTly1bdsccHDaZTCaEMH78+Oeffz4aLVksqS4ARr0BPzjr7e291UVj0IULF0II169fH9nkWrt27dq1az+6/Tvf+c6kSZMqZ1zFFV0TJkwoYXKpLgCq1qRJkyRXn5MnTyaTyQkTJoyWaB5ZbW1tK1aseOCBB0p7s44cAQDV78iRI4899tiCBQuMYjDS6fSv/MqvlHyRmeoCgCpXXNRVU1PzyCOPmMYdFRd1hRBmz56tugCAu1Bc1DVu3LgKXEdfgcq0qEt1AUD1q+RFXRWoTIu6VBcAVL/ioq6HH37YKAYjnU6vWrWqHEcOU10AUM36FnVVztGwKllxUdeHH35Y8kVdqgsAqlzfoq5YLGYad9R37sWSL+pSXQBQ5SzquittbW2f//zn77///nLcuOoCgGpmUdddSafT8+bNK9PpIFUXAFQti7ruSlkXdakuAKiSXNi+fXs+n79pu0VdA+rq6hpwXGVd1BWchxEARrVcLrdly5Z0Oh1C+N///d99+/b1v9Siro/m6Ysvvlgc1y/8wi9s27at/6VlXdQV7OsCgFGtpaVl9erVxRNI79+/v6urq/+lR44cWbFihUVdfV577bXGxsYNGzaEELZv39538p+isi7qUl0AMLrt2rXrYx/72Fe/+tXibpsVK1b0fXBWXNT1cz/3cxZ13TSuv/mbv1m5cmUI4dd+7df6xlXuRV2qCwBGvVQqFYvFWlpa4vF4NpvduXNncXtxUVc+n7eoq781a9bEYrHW1tYQwttvv/0Xf/EXxe3lXtSlugCgSkSj0ddffz2E8PLLLxc/Z7So6zZqamoOHz4cQti6dWtxL1e5F3WpLgCoHnV1dcXPGVetWpXP54uLulasWGEyA0qlUsXPGR9//PF8Pl/uRV2qCwCqSvFzxh/+8IerV6+2qOuOip8zdnV1rV69OpR5UZfqAoCq0vc 544 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...

... Phạm Xuân Trung 14 14 Hình Học giải tích trong không gian LTĐH năm 2009-2010 Hình Học giải tích trong không gian LTĐH năm 2009-2010Baỡi 27: Cho hình chóp S.ABCD có đáy ABCD là hình vuông cạnh ... những góc 45 0 và 600. Hãy tính thể tích khối hộpnếu biết cạnh bên bng 1.GV: Phạm Xuân Trung GV: Phạm Xuân Trung 24 24 Hình Học giải tích trong không gian LTĐH năm 2009-2010 Hình Học giải ... Cần có một kiến thức rộng và đầy đủ về hình học (hình học phẳng và hình học không gian).- Nhớ các định lý, các hệ quả- Đôi khi cần phải dựng thêm các hình vẽ 1) Kiến thức:- Cần có kiến thức...

... :221 24 12xy+= . Xét hình vuông ngoại tiếp (E) ( tức là các cạnh hình vuông tiếp xúc với (E) . Viết phương trình các đường thẳng chứa các cạnh hình vuông đó. Bài 8: Cho Elíp (E) :221 94 xy+= ... Vẽ đường cao AA' của tam giác ABC. Tìm toạ độ điểm A'Bài 4: Cho tam giaùc ABC bieát A(6 ;4) , B( -4; -1), C(2; -4) . Tìm toạ độ tâm và bán kính đường tròn ngoại tiếp tam giác ABC Bài ... độ trực tâm của tam giác ABC, biết toạ độ các đỉnh ( 1;2), (5;7), (4; 3)ABC−− Bài 6: Cho ba điểm A(1;6), B( -4; -4) , C (4; 0) 1. Vẽ phân giác trong AD và phân giác ngoài AE. Tìm toạ độ D và...

... tiêu điểm , độ dài 2 trục của các ELIP sau:a. 4x2 + 9y2 = 36b. x2 +4y2 = 64 c. 4x2 + 9y2 = 5d. x2 + 4y2 = 1e. 3x2 + 4y2 – 48 = 0f. x2 + 5y2 – 20 = 0caâu2. Lập phương ... x+3y-3=0 một góc 45 02) qua B(-1;2) và tạo với d2 : 2 32x ty t= += − một góc 600Bài 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 ty t y t= − = +  = + = − 2)51 & 4 0x ty t x y= += − − + − =Bài 4: cho...

... boxmath.vnLời nói đầu Hình học giải tích hay hình học tọa độ là một cách nhìn khác về Hình học . Hình học giải tíchtrong mặt phẳng được đưa vào chương trình toán của lớp 10 nhưng vẫn có trong đề thi tuyểnsinh ... luận:Vậy tọa độ 3 đỉnh còn lại của hình thoi là:A (4, −5);D(6, −1);C (2,1) hoặc A(2; 1);C (4; −5); D(6;−1) −1 1 2 3 4 5 6−5 4 −3−2−110BDICABài 41 . Trong mặt phẳng Ox y cho tam giác ... =16S∆ABC=16·512=17 4 ⇒12GK .MC =17 4 ⇔GK =172.MC=172522=1752.Nên: GK =d(G,BC) =t +7(t +2) +1152=1752⇔|8t +25|=17 ⇔t =−1 hoặc t =−21 4 .Suy ra G1(−1;1), G2−21 4 ;−13 4 Tiếp...

... 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 2sin772aSOSIOSIa= = = ·067 48 'SIO⇒ =Do ∆SIJ cân nên··0 0 0 0ISN 180 2. 180 2.(67 48 ') 44 24& apos;SIO⇒ = − = − =NI=·07.sinIS .sin (44 24& apos;)2aSI...

... BC = a. Chøng minh hÖ thøc: 3 3 23a 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...

... 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 đườngtròn . 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 thangcân 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 từkiến thức đến bài tập khó học và khó tìm ra lời giải .“Đường...

... 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 = 900.d) DE = 2AH.(Để học tốt hình học 8)V. ... vậy giúp ta đến với các bài toán hay và khósau: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, DCsao cho AE = CF. Chứng minh rằng các đờng thẳng AC, BD, EF đồng quy.Bài 1 .4: Cho hình bình hành ABCD....

... giáca) Hình chóp S.ABCD có SA vuông góc với đáy và đáy là hình vuông (hoặc hình chữ nhật). Ta chọn hệ trục tọa độ như dạng tam diện vuông.b) Hình chóp S.ABCD có đáy là hình vuông (hoặc hình thoi) ... ý+ Hình chóp tam giác đều có đáy là tam giác đều và các cạnh bên bằng nhau, nhưng không nhất thiết phải bằng đáy. Chân đường cao là trọng tâm của đáy.+ Tứ diện đều là hình chóp tam giác đều ... bên bằng đáy.+ Hình hộp có đáy là hình bình hành nhưng không nhất thiết phải là hình chữ nhật.II. CÁC DẠNG BÀI TẬP1. CÁC BÀI TOÁN VỀ HÌNH CHÓP TAM GIÁCBài 1 (trích đề thi Đại học khối D – 2002)....

... 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 oKết quảnGOgAaIP tg o 4 góc vuông 1 góc vuông 1 góc vuông Tứ giác(2) (1) (3) Hình bình hành Hình thang cân Hình chữ nhật3 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...