x={-7;-3;-1;3}
muốn giải rõ thì tk mk nha

Đặt UCLN(2n + 3 ; 4n + 8) = d

2n + 3 chia hết cho d => 4n + 6 chia het cho d

< = > [(4n + 8) - (4n + 6)] chia hết cho d

2 chia hết cho d mà 2n + 3 lẻ 

=> UCLN(2n  + 3 ; 4n + 8) = 1 

Write the comparative or superlative form of the words in brackets:

1. Minh looks (thin)........thinner...........than he did.

2.Mountains are (big).....bigger.......than hills.

3. School days are the (happy)......happiest.........of my life.

4.Who is(good)..better........,Tom or Tim?

5. It is the(modern).........more modern.......... .building in this city.

Write the correct tense of the verbs in brackets:

1.Look!They.........are playing............(play) badminton in the schoolyard.

2.Hunf often..........doesn't go.............(not go) camping in the summer.

3.Hanh........isn't reading............(not read) with the friends at the moment.

4.........Does...............Son......write...............(write) to their friends every summer holiday?

5.They.........will visit.............(visit) their grandparents tomorrow.

Đầy đủ mình mới tick

lần này bạn nguyen van dao sai  rồi

131,137,139 a thuoc {1;7;9}

tick cho to

6 chia hết cho x => x thuộc Ư(6)

=> x thuộc {-1; 1; -2; 2; -3; 3; -6; 6}  (1)

Mà x chia hết cho 6 => x thuộc B(6)

=> x thuộc {0; -6; 6; -12; 12;...}   (2)

Từ (1) và (2) => x thuộc {-6; 6}

1. They never (eat).eat..... very much

2. Listen! Bill (play)..is playing..... his electric guitar

3. He ( wash) ...washes... his car every Sunday

4. Where's Cindy ? - She ( have) ..is having..... a bath

5. My father (live) ..live..... in a house near the river because he ( like)...likes.. swiming

6. Every morning, my mother ( walk) ...walks.... in the park

7. What newspaper...do... you usually( read) ..read. ? - The Times

8. Be careful! The teacher (look) .is looking... at you

9. ....Does... your mother ( do) .do.... morning exercise every day?

10. In summer, it ( be) ..is.... very hot, so he often ( go ) ..goes...... to the seaside on holiday

11. .Are..... you (look)..looking... for Peter ? I think he ( read)....is reading.. books in the library

12. Mother ( cook ) ..is cooking... in the kitchen at the moment

13. Let's (help) .help....her