Đề thi và đáp án PPTD trong KG

... + 2n)x − my − nz − 2m − 6n = ° Mặt cầu (S) có tâm I(-1; 1; -1), bán kính R = ° (P) cắt (S) theo đường tròn giao tiếp (C) có bán kính r = ⇔ d(I; P) = R − r = ⇔ −m − 2n − m + n − 2m − 6n 2 (m ... y, z > 0) và: x = d(M; α) = 2x + 3x + 6x − 18  x = y = z = ⇔ M1 (1;1; 1) ⇔ x = y = z = ⇒ M2  ; ;   ÷  2 2  u uu uu r OM1 =

Ngày tải lên: 19/09/2015, 14:03

... SỞ GIÁO DỤC – ĐÀO TẠO CẦN THƠ TRƯỜNG THPT CHUYÊN LÝ TỰ TRỌNG KỲ THI HSG ĐỒNG BẰNG SÔNG CỬU LONG NĂM HỌC : 2005 – 2006 *********** ĐÁP ÁN MÔN TOÁN Bài 1.(Đại số – điểm) Cho hai đa thức P(x)= ... Bài 5.(Hình học không gian – điểm) Tính thể tích khối tứ diện ABCD theo bán kính r mặt cầu nội tiếp tứ diện biết tam giác ABC bán kính Ra, Rb, Rc, Rd mặt cầu bàng tiếp tứ diện theo thứ tự thuộc...

Ngày tải lên: 13/12/2013, 21:15

... eleventh (C) of (D) month 10 Mary and her sister just bought two new winters coats at the clearance sale D 10 (A) her sister 11 (B) just bought 12 (C) two new 13 (D) winters 14 15 11 It is the role of ... replace a retiring justice on the Supreme Court is a woman A 10 (A) which 11 (B) was recommended 12 (C) to replace 13 (D) retiring 14 15 16 15 Although jogging is a good way...

Ngày tải lên: 25/02/2014, 20:20

... controlled 19 (D) the 20 21 12 What happened in New York were a reaction from city workers, including firemen and policemen who had been laid off from their jobs B 22 (A) What happened 23 (B) were (C) ... 19 (B) correctly 20 (C) word processing 21 (D) computers 22 23 16 The deadbolt is the best lock for entry doors because it is not only inexpensive but installation is easy D 24 (A)...

Ngày tải lên: 25/02/2014, 20:20

... by spending their weekends living in the open B 22 (A) all 23 (B) theirselves 24 (C) the 25 (D) living 13 After to have won the light-heavyweight title at the 1960 Olympic Games, Muhammad Ali ... rash occurs within twenty-four hours after taking a new medication, the treatment should discontinued D (A) occurs (B) after taking 10 (C) medication 11 (D) should discontinued 12 13 14 19 Accordi...

Ngày tải lên: 25/02/2014, 20:20

... 10 18 A one hundred-horsepower tractor can make the work of a large number of horses C 11 (A) one hundred-horsepower tractor 12 (B) can 13 (C) make 14 (D) a large number 15 16 19 Neon is often ... illness B 11 (A) large numbers 12 (B) the rest of 13 (C) have shown 14 (D) all of the symptoms 15 16 15 Albert Einstein was such brilliant a scientist that many of his colleagues had to study for...

Ngày tải lên: 25/02/2014, 20:20

... to get rid of all those things that have been cluttering up our garages and attics for years A (A) The yard sales (B) that (C) been (D) up Bronze after being heated by a strong flame will change ... research in this field are only recently providing the kind of information that growers need to increase production C 11 (A) known as 12 (B) more than 13 (C) make 14 (D) to increase 15 16 15 Doct...

Ngày tải lên: 25/02/2014, 20:20

... to pass this economics class without help A 16 (A) enough intelligent 17 (B) to pass 18 (C) this 19 (D) economics 20 Nancy said that she went to the supermarket before coming home B 21 (A) that ... 16 (C) an altitude 17 (D) feet 18 19 20 The common field mouse is about four inches long and has a three-inched tail D 20 (A) common 21 (B) field 22 (C) long 23 (D) three-inched ... 17 (B) roami...

Ngày tải lên: 25/02/2014, 20:20

Ngày tải lên: 25/02/2014, 20:20

... (D) countries Since the early years of this century have flown across oceans to test their machines, test themselves and respond to their ... stall B 10 (A) Having lost 11 (B) supporting 12 (C) despite 13 (D) objections of 14 15 11 Almost one-half of those taking specialized courses last year were taking selfimprovement course D 16 (A)

Ngày tải lên: 25/02/2014, 20:20

... rains that had devastated the area, the governor sent the National Guard to assist in the clean-up operation A 22 (A) Because 23 (B) torrential (C) had devastated (D) to assist in

Ngày tải lên: 25/02/2014, 20:20

... buried deep in the ground have been found in the construction site opposite of the City Hall D 23 (A) Unexploded 24 (B) buried deep (C) have been (D) opposite of The sun is a huge fiery globe ... society changes, but not change at the same rate or in the same direction B 22 (A) Every society 23 (B) but not change 24 (C) same rate (D) same direction 13 Neither the mathematics department .....

Ngày tải lên: 25/02/2014, 20:20

... (C) rectangular 17 (D) varying 18 19 20 Professional medical schools were organized in the 1 780 s and surgery made major gains when anesthetics was perfected in the 184 0s D 20 (A) were organized ... people seldom lack of most of them D (A) are (B) in a (C) variety of (D) lack of 10 Forgetting something usually mean an inability to retrieve the material that is still stored somewhere in the...

Ngày tải lên: 10/03/2014, 18:20

... in the accounting class has to type their own research paper this semester C 15 (A) students 16 (B) in the 17 (C) their 18 (D) own 19 We thought he is planning to go on vacation after the first ... judicial branches D 15 (A) like 16 (B) that of the United States 17 (C) is divided 18 (D) between 19 20 12 Gunpowder, in some ways the most effective of all the explosive materials, were a mixtur...

Ngày tải lên: 10/03/2014, 18:20

... that (C) freeze (D) temperatures 10 Most fungi are scavengers who grow on the remains of plants and animals, causing them to decay and change into rich soil B 10 (A) are scavengers 11 (B) who ... awarded to people who excellent in their fields above and beyond what is expected from scholars B 10 (A) are awarded 11 (B) who excellent 12 (C) and beyond 13 (D) what 14 15 Sharks, when the cu...

Ngày tải lên: 10/03/2014, 18:20