Đáp án: A

Giải thích: cấu trúc “want sb to V”: muốn ai làm gì

Dịch: Bố mẹ muốn tôi học tiếng Tây Ban Nha.

Đáp án A

Giải thích: cấu trúc “want sb to V”: muốn ai làm gì

Dịch: Bố mẹ muốn tôi học tiếng Tây Ban Nha.

1. playing beach games is very interesting .

=>It is........very interesting to play beach games..........

2. It not a good idea to spend too much time on computer games.

=>It's better to avoid......spending to much time on computer games......

3. My patents insist me on learning sonething interesting .

=>My parents wants ...me to learn something interesting.......

1. playing beach games is very interesting .

=>It is very interesting to play beach games

2. It not a good idea to spend too much time on computer games.

=>It's better to avoid spending too much time on computer games

3. My patents insist me on learning something interesting .

=>My parents wants to me learn something interesting

Đáp án: A

Giải thích: cấu trúc “want sb to V”: muốn ai làm gì

Dịch: Bố mẹ muốn tôi học tiếng Tây Ban Nha.

Rewrite the sentences

1. Vinh really loves to hang out with friends.

Vinh really enjoys hanging out with friends.

2. Playing beach games is very interesting.

It is very interesting to play beach games

3. It is not a good idea to spend too much time on computer games.

It's better to avoid spending too much time on computer games.

4. My parent insist me on learning something interesting.

My parents wants me to learn something interesting.

5. Jenny finds reading poetry boring.

Jenny dislike reading poetry

Ex1:

1. It's not a good idea to spend your money on a new phone

-> It's better to avoid spending your money on a new phone

2. Laura didn't want to tell me the secret

-> Laura didn't feel like telling me the secret

3. My parents insist me on learning something interesting.

-> My parents want me to learn something interesting.

4. You don't need to set off early

-> It's not necessary for you to set off early

Ex1:

1. It's not a good idea to spend your money on a new phone

-> It's better to avoid ..spending your money on a new phone..

2. Laura didn't want to tell me the secret

-> Laura didn't feel like .telling me the secret..

3. My parents insist me on learning something interesting.

-> My parents want .me to learn something interesting..

4. You don't need to set off early

-> It's not .neccessarry for you to set off early..

-> My parents want .me not to set off early..

Complete the second sentence so that it has similar meaning to the first sentence

1. Vinh really loves to hang out with friends

Vinh really enjoys _hanging out with friends________

2. Playing beach games is very interesting

It is __very interesting to play beach games _______

3. It is not a good idea to spend too much time on computer games

It's better to avoid ___spending too much time on computer games ________

4. My parents insist me on learning something interesting

My parents wants__me to learn something interesting _____

5. Jenny finds insist reading poetry boring

Jenny dislikes___reading poetry____________

Lời giải:

a. Với $n$ nguyên khác -3, để $B$ nguyên thì:

$2n+9\vdots n+3$

$\Rightarrow 2(n+3)+3\vdots n+3$

$\Rightarrow 3\vdots n+3$

$\Rightarrow n+3\in\left\{\pm 1; \pm 3\right\}$

$\Rightarrow n\in\left\{-2; -4; 0; -6\right\}$

b. 

$B=\frac{2n+9}{n+3}=\frac{2(n+3)+3}{n+3}=2+\frac{3}{n+3}$

Để $B_{\max}$ thì $\frac{3}{n+3}$ max

Điều này đạt được khi $n+3$ là số nguyên dương nhỏ nhất

Tức là $n+3=1$

$\Leftrightarrow n=-2$

c. Để $B$ min thì $\frac{3}{n+3}$ min

Điều này đạt được khi $n+3$ là số nguyên âm lớn nhất 

Tức là $n+3=-1$

$\Leftrightarrow n=-4$

n² + n + 4 chia hết cho n + 1

=> n.n + n + 4 chia hết cho n + 1

=> n(n + 1) + 4 chia hết cho n + 1

Vì n(n + 1) chia hết cho n + 1 nên để n(n + 1) + 4 chia hết cho n + 1 thì 4 chia hết cho n + 1

=> n + 1 thuộc Ư(4) 

=> n + 1 thuộc {1;2;4}

Ta có bảng

Vậy n thuộc {0;1;3}

Cảm ơn bn ....và bn đồng ý kb vs mik nha......