c1: phương trình(4x +1)(x² +2)=0 có tập nghiệm là:

A. \(\left\{\frac{1}{4}\right\}\)

B. \(\left\{-\frac{1}{4};2\right\}\)

C. \(\left\{\frac{1}{4};2\right\}\)

D. \(\left\{-\frac{1}{4}\right\}\)

C2: giá trị của biểu thức 9-3x là một số âm khi

A. x\(\ge\)3

B. x >3

C. x \(\le\)3

D. x< 3

C3: kết quả nào sau đây là sai?

A. \(\left|-1\right|=1\)

B. \(\left|-x^2\right|=x^2\)

C. \(\left|x\right|=x\)

D. \(\left|x^2+2\right|=x^2+2\)

C4: phương trình 3(x-1)=x(x-1) có tập nghiệm là:

A. \(\left\{3\right\}\)

B. \(\left\{1;3\right\}\)

C. \(\left\{1;0\right\}\)

D. \(\left\{-3\right\}\)

C5: x>2 là nghiệm của b̉ất phương trình :

A. \(\frac{X-2}{-2}>0\)

B. \(4-2x< 0\)

C. \(\frac{2x-1}{2}>0\)

D. \(-2\left(x-2\right)>0\)

C6: biết m>n khi dó bắc đẳng thức đúng là ?

A. -7+ 5m <-7 +5n

B. - 3m - 7 < - 3n -7

C. 1+0,5m < 1+0,5n

D. -3m + 3n >0

C1: giải các phương trình sau:

a) 4x +5\(=\)1

b) -5x +2 \(=\)14

c) 6x -3 \(=\)8x +9

d) 7x -5 \(=\)13 -5x

e) 2-3x \(=\) 5x +10

f ) 13 - 7x \(=\) 4x -20

C2: giải các phương trình sau:

a) 2(7x +10) + 5 =3(2x -3) -9x

b) (x+1)(2x-3)=(2x-1)(x+5)

c) 2x + x(x+1)(x-1)= (x+1)(x² - x +1)

d) (x-1)³ -x(x+1)² = 5x(2 -x)-11(x+2)

C3: giải các phương trình sau:

a) \(\frac{2\left(x-3\right)}{4}-\frac{1}{2}=\frac{6x+9}{3}-2\)

b) \(\frac{2\left(3x+1\right)+1}{4}-5\frac{2\left(3x-1\right)}{5}-\frac{3x+2}{10}\)

c) \(\frac{x}{3}+\frac{x-2}{4}=0,5x-2,5\)

d) \(\frac{2x-4}{3}-2x=\frac{6x+3}{5}+\frac{1}{15}\)

C7 : giá trị của biểu thức 4x -10 không âm khi

A. x<2,5

B. x\(\ge\)2,5

C. x\(\le\) -2,5

D. x<-5

C8: Số x =-1 là nghiệm của bất phương trình nào sau đây ?

A. 10-2x<2

B. \(\left|x\right|>1\)

C. -3x +4>5

D. x+1>7-2x

c9: trong các phương trình sau,phương trình nào là phương trình bất bậc nhật một ần ?

A. -0,1x+2=0

B. 2x-3y =0

C. 4- 0.x =0

D. x (x-1) =0

C1: nghiệm của phương trình 2x+6=1 là:

A. x =-2,5

B. x =2,5

C. x=3,5

D. x=-3,5

C2:Tập nghiệm của phương trình 2x̣̣(x-3)=0

A. S=\(\left\{0\right\}\)

B. S=\(\left\{0;3\right\}\)

C. S=\(\left\{3\right\}\)

D. S=∅

C3: Tập nghiệm của phương trình \(\frac{3x-2}{2}=x\) là:

A. S=\(\left\{2\right\}\)

B. S=\(\left\{-2\right\}\)

C. S=∅

D. S=\(\left[1\right]\)

C4:Tập nghiệm của phương trình x²-16 =0

A. S=\(\left\{16\right\}\)

B. S=\(\left\{4\right\}\)

C. S=\(\left\{-4\right\}\)

D. S=\(\left\{-4;4\right\}\)

C5: Bất phương trình 2x-3>0. Có nghiệm là:

A. x>1

B. x>1,5

C. xB. x>-1,5

D. x<1,5

C6:Bất phương trình 5x<2x-3 Có nghiệm là:

A. x <-1

B. x > 1

C. x >-0,5

D. x <0,5

cho hình lập phương có cạng bằng 3cm .diện tích xung quanh của hình lập phương đó là :

A. 9cm

B. 27cm

C. 36cm²

D. 54cm²

giá trị x =1 là nghiệm của bấc phương trình

A.3x+3>9

B. -5x>4x+1

C.x-2x<2x+4

D.x-6>5-x

câu1: mệnh đề nào dười đây là đùng

A,sồ a là âm nếu 3a<5a.

B.Số a là số dương nếu 5a<3a

C.Số a là số dương nếu 3a>5a

D.Số a là số âm nếu 5a <3a

I. Vocabulary: write the Vietnamese meanings of the following words

1. benefit …………………….

2. yield …………………….

3. effect …………………….

4. quality …………………….

5. invention …………………….

6. replace …………………….

7. expert …………………….

8. telepathy …………………….

9. sense …………………….

10. biologist …………………….

II. Practice

Ex 1: Give the correct tense of verbs:

1. My mother wants me (post) ____________ this letter before afternoon.

2. I (watch) ______________ a science fiction film on TV at 9:00 tonight.

3. We (implant) ______________ chips in the brain to control devices by the year 2050.

4. Mai suggested (go) ______________ for a drink.

5. We’ve decided (stay) ________________ in Ha Noi for five more days.

6. It was (possible) ________________ for her to finish all assignments because they were difficult.

7. Nick said that he (come) ______________ from a small town in England.

8. We plan (have) ______________ a picnic this Sunday. Would you like to join us?

Ex 2: Complete the passage with the words in the box:

Telepathy: Mind to Mind Communication

The word “telepathy” has been derived from the (1) ……………….. “tele” meaning “distance” and “pathy” meaning “feeling”. So telepathy actually means getting (2) ……………… through a distance. Telepathy is the communication (3) ………………… two minds, separated over a (4) ………………, without the use of the five known senses. At some point of time or the other, we all have (5) ……………... telepathy. Maybe you were thinking of someone you haven’t talked to for months and you suddenly get a (6) ……………… from them. Or when two people are together, they might (7) ………..…… the same thing at the same time. These are natural mind-to-mind communications that occur frequently between closely related (8) ……………….

Ex 3: Read and write True or False for each statement:

Computers are helpful in many ways. First, they are fast. They can work with information even more quickly than a person. Second, computers can work with a lot of information at the same time. Third, they can keep information for a long time. They do not forget things that the common people do. Moreover, computers are almost always correct. They are not perfect, but they usually do not make mistakes. Recently, it is important to know about computers. There are a number of things to learn. Some companies have classes at work. In addition, most universities offer day and night courses in Computer Science. Another way to learn is from a book, or from a friend. After a few hours of practice, you can work with computers. You may not be an expert, but you can have fun.

1. A person works with information more slowly than a computer. _____

2. Information can’t be kept for a long time by computers. _____

3. Computers are perfect because they don’t make any mistakes. _____

4. Most universities only offer day courses in Computer Science. _____

5. After a few hours, you can work with computers. _____

Ex 4: Rewrite the following sentences so that meaning stays the same as the first one:

1. He said to me: “I will hand in my assignment to the teacher tomorrow.”

He told me that………………...…………………………..……….….………………………….

2. “We are learning more about our universe”, he said.

He said ……………………………………………………………….……………………………

3. Mary enjoys using body language when communicating.

Mary likes ……………………………..…………………………………………………………..

4. “We haven’t seen this species of gezelle before.”, the biologists said.

The biologists said ……….………………………………………………………………….….…

5. Peter did his best to finish all the duties yesterday.

Peter tried ……….………………………………………………………………………………...

6. They said: “The film begins at seven o’clock tonight.”

They said………….……...………………………………………………………………………..

Ex 5: Write the complete sentences using the suggested words or phrases.

1. Einstein / be / one / of / greatest / scientists / world.

…………………………………………………………………………………………….….…

2. He / not / love / chat / the phone / her friends.

…………………………………………………………………………………………….….…

3. She / prefer / meet / face-to-face / than / online.

…………………………………………………………………………………………….….…

…………………………………………………………………………………………….….…

5. Rossy / told / me / she / repair / laptop / following day.

…………………………………………………………………………………………….….…

6. Alexander Graham Bell / be / inventor / first telephone.

…………………………………………………………………………………………….….…

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