Chứng tỏ: 2x⁴ + 6 không có nghiệm.

Tìm nghiệm của đa thức: x + 3x²

Tìm phép tu từ trong hai bài thơ: "Bạn đến chơi nhà" và "Qua đèo ngang"

Tìm nghiệm của đa thức:

a) x² -1

b) x² - 9

c) x² - x

d) x² - 2x

e) x³ - 4x

g) 3x⁴ + 4x²

h) x² - 2x + 1

i) x² - 3x + 2

k) x² + 5x + 6

Đồ thị hàm số?: y = ax đi qua điểm A(3; -6)

a) Xác định hệ số a

b) Trong các điểmB(1; -2); C(-2; -4); D(0; 0); E(4; 5; -9). Điểm nào thuộc đồ thị hàm số? Điểm nào không thuộc đồ thị hàm số?

Trên cùng một hệ trục tọa độ, vẽ đồ thị hàm số sau:

y = 2x; y = -2x

Write a paragraph (100 - 150 words) to talk about HOW TO KEEP A HEALTHY LIFE?

Rewrite the sentences, using the give words.

1. I was impressed by the way she performed the dancing at the party.

What impreessed me .............................................................................

2. How did they get through the traffic jam this morning?

In what ..................................................................................................

3. Although he was not selected as the winner, he was still happy.

Despite ..................................................................................................

4. Surprisingly, the main character in the film was still alive and came back home.

It is surprising ........................................................................................

5. In the of being in a big hurry, Jimmy didn't take the shortcut to his workplace.

Although ................................................................................................

6. Although she performed well, she didn't receive good mark from the teacher.

................................................................................................................ performance, she didn't receive good mark from the teacher.

7. I'm neightened by horror films. However, I enjoyed watching them.

In spite of ............................................................................................... by horror films, I enjoyed watching them.

8. Is this novel hilarious?

This novel is hilarious, ...........................................................................?

9. Did he live in Kon Tum at the age of 5?

He used to live in Kon Tum at the age of 5, ...........................................?

10. Why don't we go for a picnic tomorrow?

Let's go for a picnic tomorrow, ...............................................................?

10. Why

Almost all our energy comes from oil, coal, and natural gas. We call them fossil fuels. The earth’s fossil fuels are running out. What will happen when there is no coal, oil and gas on earth?

Scientists are trying to find and use other alternative sources of energy. We can use energy from the sun, the wind, and the water.

Solar energy is unlimited. The sun supplies all the energy used to grow plants, to evaporate water for rain, and to maintain the temperature of the planet. All are necessary for human life. If we are able to collect solar energy, we will be sure to have this abundant source of power.

1. From which do plants on the earth get energy?

A. Stars

B. The Mars

C. The moon

D, The sun

2. What are the other words or phrase for fossil fuels?

A. Natural

B. Oil

C. Coal

D. Oil, gas, natural gas

3. Natural sources of energy are energy from..............

A. Wind

B. The sun

C. Water

D. The sun, wind, water

4. The word "abundant" in the passage is closet in meaning with............

A. Plentiful

B. Limited

C. Natural

D. Necessary

Cho x và y là hai đại lượng tỉ lệ thuận.

a) Viết công thức liên hệ giữa y và x biết rằng tổng hai giá trị tương ứng của x bằng 4k thì tổng hai giá trị tương ứng của y bằng 3k² ( k khác 0).

b) Với k = 4; y₁ + x₁ = 5, hãy tìm y₁ và x₁ .