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LE
11
7 tháng 2 2017
Traffic saf
ety and traffic that the world now needs to pay attention. it is not only the most
important factors crucial to the development and survival of a nation, a territory but a
junction of trade between regions of countries, cultures on world together. In advan
ced
countries, the situation and development of their traffic is quite developed with a dense
transport network and is regulated, but in Vietnam, ...
Urban transport situation in Vietnam is extremely chaotic. On average there are
thousands of cases every
year in traffic accidents, causing serious loss of life and
property. Despite being upgraded and renovated several times but the transport system of
Vietnam has not improved as much. Traffic jams occur repeatedly in large cities
damaging hundreds of billi
on per year, not only that the injuries related to traffic
accidents is also increasing, especially head injuries , spine. Circulation of vehicles on
7 tháng 2 2017
Shady! Two motorcycle lying on the sidewalk, people started rushing out of view, I see a young man with the red light, smashed into one-way doctors are going well! young man hugging his head, half-awake, got up, staggered sorry younger doctors are trying to stand up, people run to help, they asked, who yelled "uncle ko okay?" Why on earth have taught such pivot to lose it? "" Give it to the police station only make records dirty "... physicians gentle boy smile," I was not so good, careful next time remember him, please? ! "mumbled the young man apologized, then ran back up support physicians motorcycle, do not wait until the boys were on motorcycles doctors run a distance, people spread out gradually, not forgetting glances at the young man with eyes estrangement. He brought him the youth quietly ride on, promised not to repeat itself again.
LH
2 tháng 9 2016
<=> 4(x^2 + 2x + 1) + 4x^2 - 4x +1 - 8(x^2 - 1) = 11
<=> 4x^2 + 8x + 4 + 4x^2 - 4x +1 - 8x^2 +8 - 11 = 0
<=> 4x + 2 = 0
<=> x = - 1/2
ND
24 tháng 11 2019
Ta có :
\(A=1+2+2^2+2^3+...+2^{2009}+2^{2010}\)
\(=1+\left(2+2^2+2^3\right)+\left(2^4+2^5+2^6\right)+...+\left(2^{2008}+2^{2009}+2^{2010}\right)\)
\(=1+7+2^4\left(2+2^2+2^3\right)+...+2^{2008}\left(2+2^2+2^3\right)\)
\(=1+7+2^4.7+2^7.7+...+2^{2008}.7\)
\(\Rightarrow A:7\)dư 1.
#Ngụy
#Fallen_Angel
XO
24 tháng 11 2019
Ta có : A = 1 + 2 + 22 + 23 + .... + 22009 + 22010
Đặt B = 2 + 22 + 23 + .... + 22009 + 22010
Khi đó A = 1 + B
Lại có : B = 2 + 22 + 23 + .... + 22009 + 22010
= (2 + 22 + 23) + (24 + 25 + 26) +.... + (22008 + + 22009 + 22010)
= (2 + 22 + 23) + 23.(2 + 22 + 23) + ... + 22007.(2 + 22 + 23)
= 14 + 23.14 + .... + 22007.14
= 14.(1 + 23 + ... + 22007)
= 2.7.(1 + 23 + ... + 22007) \(⋮7\)
=> \(B⋮7\)
=> (B + 1) : 7 dư 1
=> A : 7 dư 1
Vậy số dư khi A : 7 là 1
LM
3
12 tháng 5 2016
điều kiện để dễ quan sát sự bay hơi là
+ gió
+nhiệt độ
+diện tích mặt thoáng của chất lỏng