BÀI 3:

bài 4:

Là mấy bài này em làm được bài nào chưa?

a: Đặt f(x)=0

=>4x-1/2=0

hay x=1/8

b: Vì g(x) có hệ số cao nhất là 3 nên m-5=3

hay m=8

Vì g(x) có hệ số tự do là -2 nên 3-n=-2

hay n=5

\(\dfrac{1}{5}+\dfrac{1}{2}-\dfrac{1}{3}=\dfrac{6}{30}+\dfrac{15}{30}-\dfrac{10}{30}\)

\(\dfrac{1}{5}+\dfrac{1}{2}-\dfrac{1}{3}=\dfrac{6}{30}+\dfrac{15}{30}-\dfrac{10}{30}=\dfrac{1}{30}\)

= 6/30+15/30-10/30

Bài 2: 

Ta có: \(3n^3+10n^2-5⋮3n+1\)

\(\Leftrightarrow3n^3+n^2+9n^2+3n-3n-1-4⋮3n+1\)

\(\Leftrightarrow3n+1\in\left\{1;-1;2;-2;4;-4\right\}\)

\(\Leftrightarrow3n\in\left\{0;-3;3\right\}\)

hay \(n\in\left\{0;-1;1\right\}\)

câu 2 is => are

5 playing => play

còn lại ok

Science and technology has become a debated topic in the society. On one hand, it is necessary for the modern life where other countries are continuously developing in the field of science and technology. It becomes very necessary for other countries too to grow in the same way to be strong and well developed other countries for the future safety and security. It is science and technology which helps other weak countries to develop and be strong. We have to take support of science and technology forever to improve the way of life for the betterment of mankind. If we do not take the help of technologies such as computer, internet, electricity, etc we cannot be economically strong in the future and would be backward forever even we cannot survive in such a competitive and technological world.

Advancement in the field of medical, agriculture, education, economy, sports, games, jobs, tourism, etc are the examples of science and technology. All such advancements show us that how both are equally beneficial for our life. We can see a clear difference in our life style while matching the ancient and modern way of life. High level of scientific and technological advancement in the field of medicine has made easy the treatment of various lethal diseases which was earlier not possible. It has helped a lot to the doctors to find effective ways to cure diseases through medicine or operations as well as research vaccines to cure diseases such as cancer, AIDS, diabetes, Alzheimer’s, Leukemia, etc.

bạn ơi bạn lấy từ đâu vậy ạ

Today, international relations in science and technology is both cooperative and competitive, so in essence, international cooperation is a manifestation of international integration, targeting the following objectives: Development of science and technology: This requires countries, organizations and individuals to cooperate and collaborate to conduct joint research to mobilize more resources, shorten time, reduce costs; Strengthening role and influence: International and regional organizations implementing S & T policy not only help developing countries but also through it to enhance the role and influence of Myself; Expand production, expand markets and increase profits: Developed countries, transnational companies expand cooperation to maintain, enhance their monopoly position, to expand production, expand Market and increase profits; Improving Competitiveness: Foreign investors must train science and technology staff, skilled workers and technology transfer to their home country. Developing countries must prepare resources, strengthen material and technical foundations for research and training, improve information and communication infrastructure, and regulate regulatory requirements. this target.

The tendency for the establishment of forms of international cooperation in science and technology is becoming more widespread with the paripation of many companies and countries in fields such as electronics, informas and telecommunications, Transportation, marine, environmental and other high-tech areas. The above cooperation is often assessed through key indicators such as the growth of incoming and outgoing traffic Of foreign direct investment; Number of laboratories, R & D centers invested or joint ventured; Mergers, joint ventures, and joint ventures between some large companies of international scale have confirmed the trend of increasing cooperation and internationalization in the manufacturing sector. Scientific research and technological development aimed at improving the capacity and competitiveness in the international market.

For developing countries, international integration in science and technology is a driving force for domes scientific and technological activities in order to effectively exploit the world's science and technology achievements. To attract foreign resources and technology to raise and develop the level of S & T in the country, contributing to the achievement of socio-economic development strategy objectives and step by step integrating into the knowledge economy of the country. world.

In our country, the Prime Minister has approved the project of international integration in science and technology to 2020 with the aim of making Vietnam a strong country in a number of science and technology fields by 2020.

trang ?

 BẠN PHẢI NÓI TRANG CHO MÌNH LÀM CHỨ KHÔNG CHO TRANG THÌ SAO LÀM ĐC

Trang mấy???

Bài 2: 

a: \(x^2+6x+9=\left(x+3\right)^2\)

b: \(4x^2+4x+1=\left(2x+1\right)^2\)

c: \(4x^2-12xy+9y^2=\left(2x-3y\right)^2\)

d: \(x^4-4x^2+4=\left(x^2-2\right)^2\)

Bài 3: 

a: \(\left(x-2\right)\left(x^2+2x+4\right)-\left(x^3+2\right)\)

\(=x^3-8-x^3-2\)

=-10

b: \(\left(x+4\right)\left(x^2-4x+16\right)-\left(x-4\right)\left(x^2+4x+16\right)\)

\(=x^3+64-x^3+64\)

=128