1..so I tired
2..I tried my best
3.. the most beautiful place in the world
4..tease the dog

1The children are playing football at the moment
2I haven't met Lan for a long time

Ảnh 1:

1. I stayed up late, so I am tired

2. I did not pass my exam although I tried my best

3. My homeland is the best beautiful place in the world

4. Don't tease the dog

Ảnh 2:

1. The children are playing football at the moment

2. I hasn't met Lan for a long time

25 What are you going to do this week?

26 We might go on holiday to the moon in the future

27 There will be a robot in my house

28 The room is very large

25.What are you going to do this week?

26.We might go on holiday to the moon in the future.

27.There will be have robot in my house.

28.The room is large

Chúc bạn học tốt✔✔

1. What do you do for fun? 

2. It is a not hobby for her.

3. Why do you like it?

4. When did you start your hobby?

5. Do you intend to continue your hobby in the future?

6. I can't help doing it from time to time.

7. Sarah enjoys collecting cover bag tea.

8. That does not much fun it sound

9. I love doing nothing in my spare time.

10. Do you find collecting seashells interesting?

Đây:

Ta có: \(2x+y+1=6\Rightarrow2x+y=5\)

Suy ra: \(4x+2y-1=\left(2x+y\right)+\left(2x+y\right)-1=5+5-1=9\)

Mik làm tắt nha bn tự trình bày lại cho hợp lí

cảm ơn bn nhìu nhìu nhen!!!!

Theo mình là đề bài sai.Giả sử nếu n = 2 thì biểu thức = 1.6-(-2).3 = 12 không chia hết cho 5

Theo mình phải là CHIA HẾT CHO 6

Câu này khá dễ bạn ạ

(n-1)(n+4)-(n-4)(n+1)

= (n^2+3n-4)-(n^2-3n-4)

=6n luôn chia hết cho 6 với n thuộc Z ^_^

Ukm. mik lỡ nhập đề bài sai sorry bạn nha!!!

cảm ơn bạn nhìu

.

b: \(=\dfrac{3}{8}\left(19+\dfrac{1}{3}-33-\dfrac{1}{3}\right)=\dfrac{3}{8}\cdot\left(-14\right)=\dfrac{-42}{8}=\dfrac{-21}{4}\)

c: \(=\dfrac{27}{23}+\dfrac{5}{21}-\dfrac{4}{23}+\dfrac{1}{2}+\dfrac{16}{21}=2+\dfrac{1}{2}=\dfrac{5}{2}\)

d: \(=\dfrac{21+26}{47}+\dfrac{1+4}{5}=2\)

1 bỏ so

-In order to V(inf): Để làm gì

3 -So as to V(inf): Để làm gì

6 me->her

-Could/can/Will+V(inf)

-Help+O+V/to V

11 ..... me where the nearest post office is?

-Can/could+S+V+wh-questions+S+V?

14 -Shall+S+V(inf)?

17 ........ going to help him revise his lessons

-"be" going to V(inf): Sẽ làm gì( mang tính chắc chắn)

18 -Would+S+love/like+to V/N?

19 -Let's+V(inf)

= Shall+we+V(inf)?

20 -Trong ngữ cảnh này "to V" được dùng với nghĩa "để làm gì"

*Inf: Infinitive

Theo bất đẳng thức tam giác ta có:

     OA + OB > AB

     OB + OC > BC

     OC + OD > CD 

     OD + OA > DA

Cộng 4 bđt trên theo vế ta được:

   2(OA + OB + OC + OD) > AB + BC + CD + DA

<=> (OA + OC) + (OB + OD) > (AB + BC + CD + DA)/2

\(\Leftrightarrow AC+BD>\frac{AB+BC+CD+DA}{2}\)