Last summer vacation, I went to Ha Long Bay with my family. It was sunny but not very hot. My younger sister and I went swimming. Then, we went to some souvenir shops. We bought a lot of different gifts for our friends. Next, my family went to a food stall for lunch. We ate fish and crab. The food was delicious, but most things were not cheap. They were quite expensive. Finally, We took a lot of photos and went to home by bus. After trip, we felt very happy because we had a great time get together. Our trip was great, if my family next time I travel, I will invite you to go with my family.

Last weekend, I was at home. The weather was sunny. In the morning, I played badminton with my brother. At noon, I helped my mother with the cooking. In the afternoon, I watched a funny film. I was very happy. 

1 This is Emma's book

2 Go straight ahead past the library and then turn right

3 They are on the wall

4 They planted the trees

1.the book is emma

2.go past the libraly and turn right

3.the pictures behind the window

4.they planted trees

My favorite holiday is Tet, the Vietnamese Lunar New Year. It usually takes place in late January or early February. To celebrate, my family cleans and decorates the house, makes traditional foods like bánh chưng, and visits relatives to exchange good wishes and lucky money for the new year.

My name is Ben. My favorite holiday is Tet, the Vietnamese Lunar New Year. I like Lunar New Year because I like watching the lion dance. It’s on February third. On this special day, my father and my mother give me lucky money. It’s fun.

1. My name is Gia Linh, I'm 10 years old

2. My favourite subject is English

    My favourite holiday is Tet holiday

    My favourite sport is swim.

3. My birthday is on 9th of December.

4. I take photos and safe them in my room.

5. I do experiments in sience class.

...

1 She likes geography

2 It is summer holiday

3 They carve pumkins and dress up

4 It starts at 9:50

5 They speak with ech other

1. She likes geography.

2. It’s Children’s Day.

3. They wear costumes.

4. It starts at nine fifty. 

5. She learns languages. 

Em đăng ký nhận thưởng sự kiện: "Viết quan điểm của em về bạo lực học đường"

Chúc mừng mọi người ạ!

∆ABC vuông tại A

⇒ tanC = AB : AC = 2 : 2,5 = 0,8

⇒ C ≈ 39⁰

⇒ ACD = 20⁰ + 39⁰ = 59⁰

∆ACD vuông tại A

⇒ tanACD = AD : AC

⇒ AD = AC.tanACD

= 2,5.tan59⁰

≈ 4,2 (m)

Độ dài vùng được chiếu sáng trên mặt đất:

BD = AD - AB = 4,2 - 2 = 2,2 (m)

độ dài vùng được chiếu sáng trên mặt đất là 2,1m

1) sin35⁰ = cos(90⁰ - 35⁰) = cos55⁰

Vậy sin35⁰ = cos55⁰

tan35⁰ = cot(90⁰ - 35⁰) = cot55⁰

Vậy tan35⁰ = cot55⁰

2) ∆ABC vuông tại A (gt)

⇒ AB = BC.cosB

= 20.cos36⁰

≈ 16,18 (cm)

Gọi vận tốc lúc về của người đó là x(km/h)

(Điều kiện: x>0)

Vận tốc lúc đi là x+10(km/h)

Thời gian người đó đi từ A đến B là \(\dfrac{60}{x+10}\left(giờ\right)\)

Thời gian người đó đi từ B về A là \(\dfrac{60}{x}\left(giờ\right)\)

Thời gian về nhiều hơn thời gian đi là 30p=0,5 giờ nên ta có:

\(\dfrac{60}{x}-\dfrac{60}{x+10}=0,5\)

=>\(\dfrac{60x+600-60x}{x\left(x+10\right)}=0,5\)

=>\(x\left(x+10\right)=\dfrac{600}{0,5}=1200\)

=>\(x^2+10x-1200=0\)

=>(x+40)(x-30)=0

=>\(\left[{}\begin{matrix}x+40=0\\x-30=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-40\left(loại\right)\\x=30\left(nhận\right)\end{matrix}\right.\)

Vậy: Vận tốc lúc về của người đó là 30km/h

vận tốc lúc về là 30km/h

a) ĐKXĐ: x ≠ -5

Phương trình đã cho trở thành:

(x + 6).2 + 3.(x + 5) = 2.2(x + 5)

2x + 12 + 3x + 15 = 4x + 20

5x - 4x = 20 - 12 - 15

x = -7 (nhận)

Vậy S = {-7}

b) x + 3y = -2

x = -2 - 3y (1)

5x + 8y = 11 (2)

Thế (1) vào (2), ta được:

5(-2 - 3y) + 8y = 11

-10 - 15y + 8y = 11

-7y = 11 + 10

-7y = 21

y = 21 : (-7)

y = -3

Thế y = -3 vào (1), ta được:

x = -2 - 3.(-3) = 7

Vậy S = {(7; -3)}