Do số cây bằng nhau nên số cây đó sẽ ϵ B(8; 9)   

                                                               ϵ B(72)

                                                               ϵ {0; 72; 144; 216; ...}

Do số cây là từ 100 - 200 cây nên mỗi đội phải trồng là: 144.

Đáp số: 144

Ta đặt số thứ nhất là: a

           số thứ 2 là: b

Ta có:

a + b = 92

3a + 5b = 384

(3a + 5b) - (a  + b) = 384 - 92

2a + 4b = 292

a + 2b = 146 (chia cả 2 vế cho 2)

(a + 2b) - (a + b) = 146 - 92

b = 54

a = 92 - 54 = 38

Vậy 2 số ban đầu là: 38 và 54.

Đáp số: 38 và 45

1. The shopkeeper warned the boy not to lean the bicycle against the window.

2. It is necessary to know English in this current market.

A : "Tôi sẽ"

B: "Đúng, còn rất thích nữa" (trong trượng hợp này)

C: "Không, tôi thích"

D. "Đúng, chúng tôi đấy"

⇒ Chọn B.

23. friends

24. speak

25. in

26. marks

27. are

Sửa:

23. friends

24. speak

25. in

26. marks

27. are

23. friends

24. study

25. in

26. scores/marks

27. are

\(A=\dfrac{1}{2^1}+\dfrac{2}{2^2}+\dfrac{3}{2^3}+...+\dfrac{2025}{2^{2025}}\)

\(2A=1+\dfrac{2}{2^1}+\dfrac{3}{2^2}+...+\dfrac{2025}{2^{2024}}\)

\(A=1+\dfrac{1}{2^1}+\dfrac{1}{2^2}+...+\dfrac{1}{2^{2024}}-\dfrac{2025}{2^{2025}}\)

Ta gọi biểu thức: \(1+\dfrac{1}{2^1}+\dfrac{1}{2^2}+...+\dfrac{1}{2^{2024}}=B\)

\(2B=2+1+\dfrac{1}{2}+...+\dfrac{1}{2^{2023}}\)

\(B=2-\dfrac{1}{2^{2024}}\)

\(\Rightarrow A=2-\dfrac{1}{2^{2024}}-\dfrac{2025}{2^{2025}}\)

\(\Rightarrow A< 2\)

1. Actually, it depends. If I'm with my friends, I would be able to try out more fun activities like roller coaster, skating or watching a horror movie together. But If I'm by myself, I would have more solitary, more time to listen to my favourite playlist, to be creative and processing thoughts would be way easier.

2. The last time I spend time by myself was yesterday, that time I was really concentrating on art and ideas, which really motivated me for the tasks that I planned.

3. Of course, especially when I have to work and make schedules. Spending time with myself also allows me to relax and lets ideas flow more smoothly.

4. I once tried a terrifying game, it scared me to death but it's also really exciting to get scared.

5. When I was a child, I used to paint every possible walls in my house, my art skills were also developing rapidly since then.

6. I recently took part in the animation field, online competitions and debate, which I really love and would probrably continue in the future.

7. I have always been dreaming of being on top of a mountain, so climbing is just the right thing for me, I love observing nature and challenging myself, trust me, it's really fun.

Đúng.