Vietnam is the second largest motorcycle ownership in the world after Taiwan. According to statistics in early 2016, the number of registered motorcycles in Vietnam is over 37 million. During the peak hours of the weekends, holidays, the number of motorbikes is too many. Traffic jams on the day are also common in the city, during working hours. The street dust and loud whistles will make you tired about road traffic in Vietnam. Investment in road traffic in Vietnam is a lot but the quality is very poor, Some routes just need light rain that will be damaged or flooded.

The sense of participation in traffic of Vietnamese is poor. Vietnamese people go fast, cross the red light. When being stuck at congestion, most people ride their motorbikes on the sidewalk rather than waiting, or constantly use horns to hasten riders in the front, even shouting at them from time to time. Vietnamese often don’t obey the traffic lights or signs. Children are taught about traffic laws while adults are breaking it. Now the government gives much new strict law to improve the present posture. The government also has a lot of projects to upgrade the road, widen the road more and more. Build more highways and tunnels to reduce traffic jam. The visitor comes to Vietnam will have some exciting experiences when entering traffic in Vietnam.

Some travelers have their traffic tips on how to cross the road in Vietnam: forget all the standard rules to cross the street, look at the vehicles that are heading towards you, just move slowly to cross the road because no one will crash into you, the foreigners will feel crossed the road like a game of adventure but you are very easy to do it

Thoi gian di het quang duong AB la

84:40=2,1

Doi 2,1gio=2 gio 6 phut

Xe may den B so gio la

2gio6phut+6gio30phut=8gio36phut

Dap so ...

Sông là dòng chảy thường xuyên liên tục trên bề mặt TĐ
Hồ là khoảng nước dạng ở vùng trũng có diện tích tương đối lớn và ổn định trên bề mặt TĐ

Every country has their traditional clothes. Ao Dai is known as traditional Vietnamese clothes especially women. According to dictionary the definition of Ao Dai is a long-sleeved tunic with ankle-length panels at front and back, worn over trousers. It can be designed with several colors, patterns such as: flower, nature and different kind of fabrics. Wearing Ao Dai, women dignify their body’s attraction as well as reflect a national culture. It has a progress of developing from short simple pattern to more sophisticate style. Ao Dai symbolizes many personalities of Vietnamese women: gentleness, diligence, kindness and bravery. Therefore, it’s very proud for women to put on the special clothes. Student and teacher wears white Ao Dai to high school and some university on Monday to join in the ceremony. Moreover, it is engagement party that the bloom dress in Ao Dai to represent the tradition of Vietnam. Not only in Vietnam, It is also famous in international market that an increasing number of foreign tourists try wearing Ao Dai when visiting my country. They have good comment and congratulation on it. Protecting and preserving the beauty and nature of it are not only the individual’s duty but also all of citizen. Besides, Ao Dai is a beneficial and comfortable costume that women can choose it for any event and party. Although there is a large number of new trend of fashion, Ao Dai always plays an important role in spiritual life of Vietnamese

One of my favorite TV shows is Running Man. This is a Korean entertainment program launched in 2010. This is an unprecedented "urban action" program and the program focuses on the urban environment. Official members of the program and guests are playing games and doing missions to win the race. Because I'm busy studying, I often watch it every weekend, when I finish studying at school. After the intense study week, Running Man is a program for me to entertain, besides it also helps me gain more knowledge through each game, adding life skills, especially solidarity. Because, in order to win the challenges, the members must unite together, overcome difficulties to win. This is a very useful program for everyone.

tổng số tuổi của cả nhà là:

24x4=96(tuổi)

nếu ko tính tuổi bố thì tổng tuổi cả nhà là:

17x3=51(tuổi)

a) tuổi bố là:

96-51=45(tuổi)

b) tuổi mẹ là:

45-3=42(tuổi)

tổng số tuổi của tôi và em tôi là:

96-45-42=9(tuổi)

tổng số phần bằng nhau là:

1+2=3(phần)

tuồi của em tôi là:

9:3x1=3(tuổi)

ĐÁp số: bố:45 tuổi

em:3 tuổi

Nhân ab vào 2 vế,ta đc:

\(\left(\frac{a}{b}+\frac{b}{a}\right).ab\ge2ab\)

\(\Rightarrow\frac{a^2b}{b}+\frac{b^2a}{a}\ge2ab\)

\(\Rightarrow a^2+b^2\ge2ab\Rightarrow a^2-2ab+b^2\ge0\Rightarrow\left(a-b\right)^2\ge0\)

BĐT đúng với mọi a;b

=>đpcm

Vận tốc của thuyền khi đi xuôi dòng là :

          7,2 + 1,6 = 8,8 (km/giờ)

Trong 3,5 giờ thuyền đi  xuôi dòng được :

          8,8 x 3,5 = 30,8 (km)

Vận tốc của thuyền khi đi ngược dòng là :

          7,2 - 1,6 = 5,6 (km/giờ)

Thời gian thuyền đi ngược dòng được quãng đường như đi xuôi dòng trong 3,5 giờ là :

          30,8 : 5,6 = 5,5 (giờ)

Đổi : 5,5 giờ = 5 giờ 30 phút

                        Đáp số : a, 30,8 km

                                      b, 5 giờ 30 phút

1+2+3+4+9 = 19

2+3+5+9=19

... v.v