1- in

2- On

3- on

4- in

5- On

6- on

7- on

8- in

9- at

10- at

tên bn rất hay

A = 1 + 3^1 + 3^2 + ... + 3^100

3A = 3 + 3^2 + 3^3 + ... + 3^101

3A - A = 3 + 3^2+3^3 +... + 3^101 - (1 + 3^1 + 3^2 + ... + 3^100)

2A = 3 + 3^2 + 3^3 + ... + 3^101 - 1 - 3^1 - 3^2 - ... 3^100

2A = (3 - 3) + (3^2 - 3^2)+...+(3^100-3^100) + (3^101 - 1)

2A = 0 + 0+ ..+ 0 + 3^101 - 1

2A = 3^101 - 1

A = (3^101 - 1)/2 < 3^101/2

Vậy A < 3^101/2

Đặt A = 3⁰ + 3¹ + 3² + … + 3¹⁰⁰

B = \(\frac12\) * 3¹⁰¹

Ta có:

+) A = 3⁰ + 3¹ + 3² + … + 3¹⁰⁰

⇒ A = \(\frac{3^{101}-1}{3-1}=\frac{3^{101}-1}{2}\)

+) B = \(\frac12\) * 3¹⁰¹

⇒ \(B=\frac{3^{101}}{2}\)

Vì \(\frac{3^{101}-1}{2}<\frac{3^{101}}{2}\) nên 3⁰ + 3¹ + 3² + … + 3¹⁰⁰ < \(\frac12\) * 3¹⁰¹

Vậy A < B

nhìn người thân được vui vẻ

cách lm bn vui:

-  nghe vài bài nhạc bn yêu thích

- ra ngoài đi bộ 10 – 20 phút, hít thở ko khí trong lành.

- xem một video hài, phim hoạt hình hoặc nhx clip khiến bạn từng bật cười

- trò chuyện vs một ng bạn hoặc ng thân mà bn tin tưởng

- chơi với thú cưng (nếu có)

- lm một vc mk thích  (đọc truyện, vẽ, chơi game vừa phải, giải đố... )

- vt ra điều đang khiến bn buồn. Đôi khi chỉ cần viết xuống cx giúp đầu óc nhẹ hơn

- ăn một món mình thích và uống đủ nc

- ngủ hoặc chợp mắt 15 – 30 phút nếu bn đang mệt

- nghĩ về 3 điều nhỏ khiến bn thấy bt ơn hoặc vui trong ngày, dù rất đơn giản

32. "You stole that bicycle," the policeman said to him.

33. She doesn't know where he has been.

37. Ann pleaded with her boyfriend not to drive so fast.

44. William accused Amanda of stealing his best cassette.

45. The nurse asked Mrs. Bingley how old her little boy was.

46. The travel agent asked me whether I wanted to insure my luggage or not.

50. He advised me to take it easy or I would have another heart attack.

51. He said that when it stopped snowing, they had to start digging themselves out.

53. The teacher told the boys to make less noise.

54. The other driver accused me of causing the accident.

55. Helen said, "Shirley, where do you get your hair done?"

57. "I'm sorry but the train left five minutes ago," said the porter to us.

60. I asked if they had to go so soon.

32. "You stole that bicycle," the policeman said to him.

33. She doesn't know where he has been.

37. Ann pleaded with her boyfriend not to drive so fast.

44. William accused Amanda of stealing his best cassette.

45. The nurse asked Mrs. Bingley how old her little boy was.

46. The travel agent asked me whether I wanted to insure my luggage or not.

50. He advised me to take it easy or I would have another heart attack.

51. He said that when it stopped snowing, they had to start digging themselves out.

53. The teacher told the boys to make less noise.

54. The other driver accused me of causing the accident.

55. Helen said, "Shirley, where do you get your hair done?"

57. "I'm sorry but the train left five minutes ago," said the porter to us.

60. I asked if they had to go so soon.

sai chỗ nào

Chào bn, tất cả các câu trả lời của bn đều đúng hết r nhé.

Robert isn't going to Jane's party next Saturday. He doesn't have time.

Robert isn't going to Jane's party next Saturday. He doesn't have time.

1. He usually eats eggs for breakfast.

2. Are you doing your homework now?

3.  They don't go to school on Sundays.

1. he usually eats eggs for breakfast

2. are you doing your homework now ?

3. they don't go to school on sundays

1m\(^3\) = 1m x 1m x 1m = 10dm x 10dm x 10 dm = 1000dm\(^3\)

1 m = 10 dm

10dm = 10 x 10 x = 1000 dm3=1m3

bn vào phần trl của mk xem nhé, nó bj ẩn.

cau trả lời của mk bị ẩn, bn vào trang cá nhân của mk xem nhé!

minh cảm ơn nhiều