IV/ matching each word in column A to its definition in column B

A

1. Climate=>F. Normal weather conditions of a region

2. Comprise=>H. Consist of, have as parts or members

3. Optional=>G. That you can choose or not choose

4. Territory=>A. Area of land that belongs to a country

5. Separate=>I. Divide, stop being together

6. Compulsory=>J. Obligatory, that must be done by law

7. Impress=>E. Make somebody feel admiration and respect

8. Friendliness=>C. Showing kindness and pleasantness

9. Correspond=>D. Write letters to and receive them from sb

10. Population=>B. Number of people who live in a country

=> 2(4-x)(11-5y) =18

=> (4-x)(11-5y) =9=1.9 =9.1 =3.3

+4-x =1 => x = 3 và 11-5y =9 =>5y =2 loại

+4-x =9  loại

+4 -x =3 => x =1 và 11-5y =3 => 5y =8 loại

Vậy không có  hai số tự nhiên nào thỏa mãn.

1. She feels comfortable to watch TV

=> Watching TV makes her comfortable

2. Ba went out without saying a word.

=> Ba went out and didn't say any word

7: I'd like to buy....

8:We are rehearsing a play at the moment

9:Where do they spend......

10:Students in the USA usually don't wear uniform

11:Linda will be fourteen next birthday

1. raise/ youths / ,/ we/ build/ money/ If/ shelter/ we/ homeless/ enough/ will / a/ for/ these/

=>If we raise enough money,we will built a shelter for these homeless youths

2. have/ recently/ trees/ They/ public/ planted/ areas / in

=>They have planted trees in areas recently

3. thinks/ he/ clother/,/charity/ is/ Because/ donates/ good/ lot/ Tony/ warm/ a/ of.

=>Because Tony thinks charity is good and warm a lot of ,he donates clother

4. over/ I wall/ mural/ grafiti/ this/ Can/ paint/ words/ a/ ?/

=>Can I paint this graffity words over a mural wall?

5.you/ yet/ Summer/ Green/ Have/ registered/ Campaign/ ?/

=>Have you registed green summer campain yet?

(ab)*(cd) = (bbb) = 111*b = 3*b*37 ♦ 
♦ => hoặc (ab) hoặc (cd) chia hết cho 37 
a) (ab) chia hết cho 37 
a1) (ab) = 74 
=> 74*(cd) = 444 => (cd) = 444 / 74 = 6 (loại) 
a2) (ab) = 37 => (cd) = 3*b = 3*7 = 21 

b) (cd) chia hết cho 37, (cd) = 37 hoặc (cd) = 74 
Ta loại (cd) = 74 vì lúc đó 10 ≤ (ab) = 3*b*37 / (cd) = 3*b*37 / 74 = 3*b / 2 => b chẵn và b > 6 => b = 8 
=> (ab) = 12, mâu thuẫn vì b = 8 
Vậy (cd) = 37 => 10a + b = (ab) = 3*b*37 / (cd) = 3*b*37 / 37 = 3b 
=> 5a = b => a = 1 => b = 5 

Các chữ số phải tìm (a, b, c, d) = (3, 7, 2, 1), (1, 5, 3, 7)