de thi thu dai hoc khoi a a mon toan truong thpt lang giang so 1

... 0.25 3 Điều kiện: 1 2 x                  3 2 3 2 3 3 3 1 8 2 1 4 12 13 5 3 2 1 8 2 1 3 2 1 4 12 13 5 4 2 1 1 2 1 4 1 1 4 2 1 2 1 4 1 1 3 x x y y y x x x x y y y x ... hai phần (phần 1 hoặc phần 2) 1. Theo chương trình chuẩn. 7a Gọi 1 11 7 11 23 ; ; 14 2 2 a a A A a MA a                    ...

Ngày tải lên: 17/02/2014, 23:49

... = 2 1 1 2 1 abc abc ab b bc c abc ac a bc abc   + +  ÷ + + + + + +   = 1 1 1 2 1 1 1 2 ab b ab b ab b ab b   + + =  ÷ + + + + + +   0,25 0,25 0,25 Dấu đẳng thức xảy ra khi a= b=c =1. Vậy ... ra 2 2 2 3 2( 1 )a b ab b+ + ≥ + + Tương tự : 2 2 2 3 2( 1) b c bc c+ + ≥ + + 2 2 2 3 2( 1) c a ac a+ + ≥ + + Khi đó: 1 1 1 1 2 1 1 1 P ab b bc c ac a...

Ngày tải lên: 02/12/2013, 21:11

... ++ ++ +++ 222 4 abcabc abcbcacab (*) Ta cú: (*) ++ ++ +++ 333 222 4 abcabc aabcbabccabc ++ ++ ++++++ 333 ()()()()()()4 abcabc abacbcbacacb p dng BT Cụ-si, ta cú: ++ ++ ++ 3 3 ()()884 aabac a abac (1) ++ ++ ++ 3 3 ()()884 bbcba b bcba ... nMNu 1 1 ,(5;22 ;19 ) 2 ộự =-=- ởỷ uuuur rr ị Phng trỡnh mp(P): xyz 52 219 90 ++= . b) AB (2;3;4) = uuur ị AB // d 1 . Gi A...

Ngày tải lên: 24/03/2014, 15:09

... NỘI =========================================================================== ~ ' ' AO SA SAO ACC AC CC ⇒ = ⇒ ∆ ∆ ' ~ACC AIO ⇒ ∆ ∆ (I là giao điểm c a AC’ và SO) &apos ;SO AC⇒ ⊥ (1) Mặt khác ( ' ') 'BD ACC A BD AC⊥ ⇒ ⊥ (2) Từ (1) và ... điểm c a SD và SB AB = AD = a, góc BAD = 60 0 ⇒ ∆ ABD đều ⇒ OA = 3 , 3 2 a AC a= SA = 2AA’ = a 3...

Ngày tải lên: 05/09/2013, 08:10

... a c ca a Tương tự ta có: 2 2 1 1 1 1 (2), (3). 1 ( ) 3 1 ( ) 3b c a b c a b c ≤ ≤ + + + + Cộng (1) , (2) và (3) theo vế với vế ta có: 2 2 2 1 1 1 1 1 1 1 1 ( ) 1 ( ) 1 ( ) 1 ( ) 3 3 ab bc ca a ... tam giác ABC, biết A( -1; 0; 1) , B (1; 2; -1) , C( -1; 2; 3). Câu VII .a (1 điểm): Khai triển a thức: 20 2 20 0 1 2 20 (1 3 ) .x a a x a x a x− =...

Ngày tải lên: 29/08/2013, 11:21

... create a language that was as uncomplicated as possible. This first language included words such as ab, ac, ba, eb, be, and ce. This did not result in a workable language in that these monosyllabic ... tsunamis that hit the Hawaiian Islands, however, originate thousands of miles away near the coast of Alaska, so these tsunamis have a much greater distance to travel and the inhabit...

Ngày tải lên: 13/03/2014, 10:23

... misunderstandings among cultures. In Zamenhof’s first attempt at a universal language, he tried to create a language that was as uncomplicated as possible. This first language included words such as ... tsunamis that hit the Hawaiian Islands, however, originate thousands of miles away near the coast of Alaska, so these tsunamis have a much greater distance to travel and the inhabi...

Ngày tải lên: 13/03/2014, 10:23

... In Zamenhof’s first attempt at a universal language, he tried to create a language that was as uncomplicated as possible. This first language included words such as ab, ac, ba, eb, be, and ce. ... try to make this happen. Question 6: The topic of this passage is A. one man’s efforts to create a universal language B. using language to communicate internationally C. a language d...

Ngày tải lên: 13/03/2014, 10:23

... tsunamis that hit the Hawaiian Islands, however, originate thousands of miles away near the coast of Alaska, so these tsunamis have a much greater distance to travel and the inhabitants of Hawaii ... help to alleviate some of the misunderstandings among cultures. In Zamenhof’s first attempt at a universal language, he tried to create a language that was as uncomplicated as possibl...

Ngày tải lên: 13/03/2014, 10:23

... between deserts and arable land; wherever human activity leads to land abuse in these fragile marginal areas, soil destruction is inevitable. [1] Agriculture and overgrazing are the two major sources ... The appearance of the steamboats and railroads have reduced transportation cost and had effects on conditions of workers. C. The appearance of steamboats and railroads had reduced transp...

Ngày tải lên: 13/03/2014, 10:23