1+1=2

3× (5 - x) = -3

=> 5 - x = -3 : 3

=> 5 - x = -1

=> x = 5 - (-1)

=> x = 6

(-30)+14 = -16

a. f(1) = 3 . 1 = 3

f(-2) = 3 . (-2) = -6

f(1/2) = 3 . 1/2 = 3/2 = 1.5

b. f(x) = 3x

=> f(-3) = 3 . (-3) = -9

=> f(-2) = 3 . (-2) = -6

=> f(-1) = 3 . (-1) = -3

=> f(0) = 3 . 0 = 0

=> f(1) = 3 . 1 = 3

=> f(2) = 3 . 2 = 6 

1. is

2. work

3. lives

4. was

5. lived

6. How is she today?

7. When did you come here?

Her name is Hoa. She is 13 years old. She lives in a house at 12 Quang Trung Street. Hoa's birthday is in August. Hoa often goes to school by bike. She often plays soccer after school. She goes to bed at 9.30 p.m.

1. to do

2. to support

3. to meet

4. learning

5. to invite

6. going

7. to help

1. How many cups of butter do we need for this recipe?

2. How many milk would you like in your tea?

3. How many grapes are there in the fridge?

4. How many cakes did she make for the party last night?

5. How much pork does your mother want for the barbecue?

6. How much cat food did you buy at the supermarket yesterday?

7. How many exams did they have so far?

8. How much tea is there in the teapot?

1. A. isn't he

2. D. won't you

3. B. do they

4. B. didn't she

5. A. did he

6. don't they

7. D. hasn't he

8. A. shall we

9. B. has he

10. A. have you

f (-1/2) = (-1/2)^2 + 4

= 1/4 +  4

= 0,25 + 4

= 4,25

f (5) = 5^2 + 4

= 25 + 4 = 29

f (x) = 9

=> x^2 + 4 = 9

=> x^2 = 9 - 4

=> x^2 = 5 

=> x = $\sqrt{5}$

49÷x+56÷x=7

(49+56) : x = 7

105 : x = 7

x = 105 : 7

x =  15

17×34+17×39+17×11

= 17 × ( 34 + 39 + 11) 

= 17 × 84

= 1428

- This table isn't made of wood.

- Is this table made of wood?

108:(x-2)=6

x - 2 = 108 : 6

x - 2 = 18

x = 18 + 2

x = 20

1. We have some chairs and a table in the kitchen.

2. We musn't throw rubbish.

3. My mum is more careful than my grandma.

4. Do you have a computer in your room?

5. Ha is more hard-working than Quang.

6. Apples are more expensive than oranges.

7. Could you tell me how to get to the post office?

8. The art gallery is behind the cathedral.

9. I like the living room best in the house.

10. She has big brown eyes. 

1.  A= 78+(-x)+(-98)+x+(-2000)

A= 78 - x - 98 + x - 2000

A= (78 - 98 - 2000) + (-x + x)

A = -2020 + 0

A = -2020

My dad doesn't mind ....my mom from work every day
A/ pick up
B/picked up
C/picking up
D/picks up
5. Life in a small town is.... than that in a big city.
A/peaceful
B/much peaceful
C/less peaceful
D/ more peaceful
6. When Jack ... to the market, he suddently met his famous singer
A/went
B/goes
C/is going
D was going

C. Acting

A. have

a. Gia đình thực sự là tổ ẩm, nuôi dưỡng, giáo dục mỗi con người. Gia đình có bình yên thì xã hội mới ổn định. Vì vậy, ý nghĩa của việc xây dựng gia đình văn hóa là góp phần xây dựng xã hội thêm văn minh, tiến bộ để đất nước càng ngày càng phát triển

b. Những việc bản thân mỗi người và học sinh cần làm để xây dựng gia đình văn hóa:
- chăm ngoan, học giỏi
- kính trọng người lớn tuổi
- thương yêu, vâng lời cha mẹ, ông bà, anh chị
- không đua đòi ăn chỏi sa đọa
- không làm gì tổn hại đến danh dự gia đình, người thân
- phấn đấu phát triển để trở thành một công dân gương mẫu, có ích cho xã hội và đất nước