HỎI CÁC BÁC TÍ LÀ GIỜ TRÊN STEAM NÓ HIỆN CODE ERROR : 118 THÌ SỬA SAO Ạ , MÌNH CX K LOAD NỔI PROFILE CỦA MÌNH NX . K CÓ WEB NÀO HỎI NÊN VÀO TẠM WEB NÀY HỎI MONG CÁC BÁC GIÚP !!! TKS!

Quãng đường AB dài 120 km. Một người đi xe đạp từ A đến B với vận tốc 20 km/h. Sau khi người đó đi được 1,5 giờ thì có một người đi xe máy từ B về A với vận tốc 40 km/h. Hỏi sau bao lâu kể từ khi người đi xe máy xuất phát thì hai người gặp nhau?

A. PHONETICES
I)-Write the words from the box in the correct part of the table, according to the stress pattern.
unacceptable
unachievable
unafraid
uncertain
unambitious

uncomfortable
unaware
unbelievable
unfasten
unemployment

uncommon
uncommunicative
unworried
uncompleted
unpopular

impossible
immeasurable
impersonal
improbable
immortal

immovable
immaterial
imprecision
impurity
impassable


oOo


ooO



oOoo




ooOo


oOooo


ooOoo


ooOooo


II)-Write the opposite of these words, using un- or im-, and then read the words aloud.
attractive ____________________
polite _______________________

practical ______________________
natural ______________________

official _______________________
pleasant _____________________

competitive ___________________
lucky ________________________

necessary _____________________
 proper ______________________

B. VOCABULARY AND GRAMMAR
I)-Complete the following sentences with nouns indicating people.
A person who paints or draws is a/an ____________________.
A person who writes novels is a/an ______________________.
A person who is starting to learn something for the first time is a/an __________.
A person who is in your family who lived a long time before you is a/an ________________.
A person who plays the piano is a/an ______________________.
II)-Use the correct form of the words given to complete the sentences.
Some types of computer games can be _________________. (educate)
Smartphone can vary from day to day due to new _____________ by different companies in the word. (invent)
The _________________ of a nuclear power plant costs a lot of money. (construct)
Space _______________ brings a bout many benefits to science. (explore)
Life is become easy and __________________ through science and technology. (comfort)
Nuclear waste is _______________ for both human and the environment. (harm)
III)-Put the verbs in brackets into the correct future tense.
Japan (built)_________________ a robotic moon base by 2020, built by robots, and for robots.
China (connect) __________________ Beijing to London with a high-speed railway soon.
Car-makers (design) __________________ self-driving cars to offer extreme safety and ease of transport.
The US military officials say that navy ships (run) _______________ on 50 percent of biofuels by 2020.
We (implant) ______________ chips in the brain to control devices by the year 2050.
With commercial space travel, we (take) __________________ minerals from the moon at this time in 2030.
Universal translation (become)_______________ common in mobile devices.
We (create) ______________ a synthetic brain that functions like the real one in year 2050.
IV)-Change the sentences into reported speech.
The scientist: “Cloning will become more popular in the next century.”
The scientist said that .
Dr. Nelson: “Every home will have at least one robot to perform any boring task."
Dr.Nelson said that .
Our teacher: “Parents do not allow children to play computer games for a long period of time.”
Our teacher told us that ___________________________________________.
The doctor: “Nutrition pills can cause serious side effects.”
The doctor told his patient that _____________________________________.
The physicist: “Nuclear power plants don`t require a lot of space.”
The physicist said that ____________________________________________.
The politician: “Wrong decisions in Chernobyl caused a big nuclear explosion.”
The politician told the audience that _________________________________.
V)-Read the conversation between Duong and Chau, and then report what Chau told her friend, using reported speech.
Duong: You know, Alexander Graham Bell invented the telephone in 1876.
Chau: Many people think that the real inventor of the telephone was Antonio Meucci, a poor Italian American.
Duong: Really? How could he do that?
Chau: He shared a workshop with Bell in the 1860s, and made a “talking telegraph” for his wife, who was ill in bed.
Duong: Why didn’t Meucci become the inventor?
Chau: He didn`t become the inventor because he never took his idea to the US Patent Office.
Duong: Why not?
Chau: He was too poor to pay the $250 that he needed.
Duong: But Alexander Graham Bell is considered the inventor of the telephone, isn`t he?
Chau: Alexander Graham Bell took the invention to the Patent Office, and became the inventor.
Chau said that ___________________________________________________

She said that ____________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
C. SPEAKING
I)-Read the article about Tim Berners-Lee, the inventor of the World Wide Web, give the answers to the questions in the conversation, and practise it in pairs.
An ordinary life... an amazing idea
Tim Berners-Lee looks very ordinary. He is about sixty years old and has brown hair. He was born

Rút gọn các biểu thức sau:

a) \(\frac{x^2+6\sqrt{x}+9}{x^2-3}\) với x ≥ 0 và x ≠ 9

b) \(\sqrt{\frac{x^2+4x+4}{x+2}}\) với x ≠ -2

p/s: đề bài k sai 1 từ nào .

Rút gọn các biểu thức sau : a) \(5\sqrt{25a^2}-25a\) với a < 0

b) \(\sqrt{49a^2}+3a\) với a \(\ge\) 0

c) \(\sqrt{16a^4}+6a^2\) với a bất kì

d) \(3\sqrt{9a^6}-6a^3\) với a bất kì