A+1023+B

=1245+1023+3456

=2268+3456

=5724

Thay `A = 1245 , B = 3546` vào, ta có:

`1245 + 1023 + 3546`

`= 2268 + 3546`

`=5814`

Vậy: `A + 1023 + B = 5818` với `A =1245; B = 3546`

Tung... Basic... A4...physics

1 B

2 B

3 C

4 D

5 D

6 C

7 A

8 C

9 B

10 D

1. A. depression   B. expert   C. essential   D. obesity 
2. A. charitable   B. community   C. service   D.  people
3. A. disabled   B. donate   C. elderly   D. graffiti
4. A. homeless   B. interview   C. difference   D. compose
5. A. mentor   B. mural   C. service   D. campaign
6. A. children   B. shelter   C. composer   D. traffic jam
7. A.  organization   B. volunteer   C. non-essential   D. recognition
8. A. tutor    B. public   C. transport (v)    D. clean-up
9. A. campaign   B. punish   C. graffiti   D. non-profit 
10. A. traffic jam    B. anthem   C. atmosphere   D. compose

2. A. melody   B. cycling C. collect   D. eggshell

3. A.  fragile   B. fishing   C. gardening   D. gymnastics

4. A. hobby   B. arrange    C. model   D. pottery

5. A. melody   B. monopoly   C. mountain D. allergy

 6. A.  unique   B. calorie   C. unusual   D. conjunction

7. A. compound   B. concentrate   C. coordinate   D. diet

8. A. independent   B. depression   C. attention   D. conjunction

9. A. itchy   B. junk food   C. sickness   D. triathlon 

10.  A. sunburn   B. vegetarian   C. benefit   D. blanket

a) Tứ giác `ABCD` có `hat{A} + hat{B} + hat{C} + hat{D} = 360^o`

Do chúng lần lượt tỉ lệ với `2;3;6;7`

`=> hat{A}/2 = hat{B}/3 = hat{C}/6 = hat{D}/7`

Áp dụng t/chất dãy tỉ số bằng nhau:

`=>  hat{A}/2 = hat{B}/3 = hat{C}/6 = hat{D}/7 = (hat{A} + hat{B} + hat{C} + hat{D})/(2+3+6+7) = (360^o)/18 = 20^o`

`-> {(hat{A} = 20^o . 2 = 40^o),(hat{B} = 20^o  3 = 60^o),(hat{C} = 20^o . 6 = 120^o),(hat{D} = 20^o . 7 = 140^o):}`

Vậy ...

`a, 5` tạ `= 5: 10 = 0,5` tấn

`2 dm = 2 : 10 = 0,2 m`

`250 g = 250 : 1000 = 0,25 kg`

`b, 2,5` tấn `= 2,5 \times 1000 = 2500 kg`

`0,14 m = 0,14 \times 100 = 14 cm`

`0,8 l = 0,8 \times 1000 = 800 ml`

Mình chưa hiểu cho lắm?

1.    Write the second sentence so that it has the same meaning to the first

1, If you often go swimming, you will keep fit

è Swimming .....will keep you fit........................

         2, It's a good idea to do exersice regularly

è You ………should do exercise regularly…………….........

          3,  Tom’s gained 5 kilos since he quit smoking

è Tom’s put …on 6 kilos since he quit smoking…………………….

2.   Rewrite the sentence, using the given words

1,  You shouldn’t skip your breakfast

è ……It is unhealthy to ski[ your breakfast……………………………………….. (healthy)

          2,  Boys don’t have as much acne as girls

è ……Girls have more acne than boys………………………………………(than)

3,  Doing exersice every day is a good idea

è ………You should do exercise everyday……………………………………(should)

What can they do ?