Rút gọn các biểu thức sau

\(\sqrt{16\left(2a-3\right)^2}\) + \(3\sqrt{a^2}\)

Choose the letter A, B, C or D to answer these following questions

The history of the computer in the twentieth century is one of dramatic adaption and expansion. The computer had modest beginnings in areas where it was used as a specialist tool. The first electronic computer was built in the 1930s and was solely for use of undergraduate students in Iowa State University to handle mathematical computations in nuclear physics. In World War II, computers were developed in order to wage counter espionage and break codes used by the enemy. In the post-war years the scope of computers was expanded to include the military industrial complex and academia. Obviously people needed to travel around these institutions and so there was a need for early network tools. In the 1960’s an early version of the Internet, ARPPANET was used in computers were starting to change our lifestyle, the way we do business and many style things (Elliot, 1994) and by the late 1980s, networks were expanding to embrace sections of the general public. The internet was born.

Question:What is the name of the early version odd the Internet?

A. INTRANET

B. CONPANET

C. INTERNET

D. ARPPANET

Rewrite the following sentences using given words.

hane/ you/ any/ Do/ pets?

program tong;

use crt;

var i,n:integer;

s:real

Begin

write(' nhap n'); readln(n);

s:=0;

for i:= 1 to n do

s:=s+\(\dfrac{1}{i}\)

write(' tong la',s);

readln;

End.

Trong các chất sau: axit axetic, glixerol, glucozơ, ancol etylic. Số chất hòa tan được Cu(OH)₂ ở nhiệt độ thường là

A. 3

B. 2

C. 1

D. 4

Dựa vào hình 22.2 (trang 84 – SGK), em hãy nhận xét tình hình tỉ suất tử thô của toàn thế giới và ờ các nước đang phát triển, các nước phát triển, thời kì 1950 - 2005.

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the question.

By mid-century, there will likely be 9 billion people on the planet, consuming ever more resources and leading ever more technologically complex lives. What will our cities be like? How much will artificial intelligence advance? Will global warming trigger catastrophic changes, or will we be able to engineer our way out of the climate change crisis?

Making predictions is, by nature, a dicey business, but to celebrate the 40^th anniversary of Smithsonian magazine Big Think asked top minds from a variety of fields to weigh in on what the future holds 40 years from now. The result is our latest special series, Life in 20 50. Demographic changes in world population and population growth will certainly be dramatic. Rockefeller University mathematical biologist Joel Cohen says it's likely that by 2050 the majority of the people in the world will live in urban areas, and will have a significantly higher average age than people today. Cities theorist Richard Florida

thinks urbanization trends will reinvent the education system of the United States, making our economy less real estate driven and erasing the divisions between home and work.

Large migrations from developing countries like Indonesia, Malaysia, Bangladesh, Mexico, and countries in the Middle East could disrupt western governments and harm the unity of France, Germany, Spain, the Netherlands, Poland, and the United Kingdom under the umbrella of the European Union.

And rapidly advancing technology will continue ever more rapidly. According to Bill Mitchell, the late director of MIT's Smart Cities research group, cities of the future won't look like "some sort of science -fiction fantasy" or "Star Trek" but it's likely that "discreet, unobtrusive" technological advances and information overlays, i.e. virtual reality and augmented reality, will change how we live in significant ways. Self-driving cars will make the roads safer, driving more efficient, and provide faster transports. A larger version of driverless cars-driverless trucks-may make long haul drivers obsolete.

Meanwhile, the Internet will continue to radically transform media, destroying the traditional model of what a news organization is, says author and former New York Times Public Editor, Daniel Okrent, who believes the most common kinds of news organizations in the future will be "individuals and small alliances of individuals” reporting and publishing on niche topics.

Which of the following predictions in paragraph 2 is NOT true?

A. The world population will grow considerably.

B. The humans will have a longer life span.

C. Urbanization trends will increase the separation between home and workplace.

D. More and more inhabitants choose urban areas to live.