A.O

1. Is this Mark? Yes, it is.
3. Is that Tom? No, it isn't.
5. Is that Ms Taylor? Yes, it is.

mik nghĩ không sao đâu

1. The instructor warned the sportsman not to repeat the mistake.
2. My neighbour told me that as soon as he/she heard from him, he/she would let me know.
3. She said that she would live in town till her husband returned from the expedition and when he returned, they would go to the seaside together.
4. She remarked that she hoped they would have taken a decision by the end of the meeting.
5. He said that that story had happened long before and few people remembered anything about it.
6. My sister suggested going to see Aunt Mary on Sunday.
7. James asked me if I wanted him to type that letter for me.
8. James asked Jill when she expected to finish her assignment.
9. He said that those old buildings might have already disappeared by the time he was back the following year.
10. Rose said that she had just been leaving the office when she had come face to face with a stranger.
11. Richard asked Jane if it was true that her father had fought in the previous war.

• Nếu \((n - 1)^2\) chia hết cho \(5\) \(\Rightarrow A = (n - 1)^2 + 2\) chia cho \(5\) dư \(2\).
• Nếu \((n - 1)^2\) chia cho \(5\) dư \(1\) \(\Rightarrow A = (n - 1)^2 + 2\) chia cho \(5\) dư \(3\).
• Nếu \((n - 1)^2\) chia cho \(5\) dư \(4\) \(\Rightarrow A = (n - 1)^2 + 2\) chia cho \(5\) dư \(6\) (tức là dư \(1\)).

• \(m_{\text{Fe}_2\text{O}_3} = 16\text{ g}\)
• \(m_{\text{Fe}} = ?\text{ g}\)

• Số mol \(\text{Fe}_2\text{O}_3\) là:
  \(n_{\text{Fe}_{2}\text{O}_{3}}=\frac{16}{160}=0,1\text{\ (mol)}\)
• Phương trình hóa học:
  \(\text{Fe}_{2}\text{O}_{3}+3\text{CO}\xrightarrow{t^{\circ }}2\text{Fe}+3\text{CO}_{2}\)
• Theo phương trình ta có:
  \(n_{\text{Fe}}=2\cdot n_{\text{Fe}_{2}\text{O}_{3}}=2\cdot 0,1=0,2\text{\ (mol)}\)
• Khối lượng sắt thu được là:
  \(m_{\text{Fe}}=0,2\times 56=11,2\text{\ (g)}\)
• Đáp số: 11,2 g

• Cú pháp đơn giản như tiếng Anh.
• Giúp tập trung vào logic thuật toán.
• Tránh bỡ ngỡ bởi cú pháp phức tạp.
• Viết mã nguồn ngắn và nhanh hơn.

• Học kỹ biến và kiểu dữ liệu.
• Thực hành vòng lặp, câu điều kiện.
• Tập viết các hàm cơ bản.
• Làm các dự án game nhỏ.

• Chuyển khi đã vững tư duy logic.
• Học cách quản lý bộ nhớ máy tính.
• Nắm chắc khái niệm con trỏ pointer.
• Luyện tập lập trình hướng đối tượng.

• W3Schools để tra cú pháp.
• LeetCode để luyện thuật toán.
• Các khóa học miễn phí trên YouTube.

• Trường hợp 1: \(2x - 1 = 1 \Leftrightarrow 2x = 2 \Leftrightarrow x = 1\) (thỏa mãn)
  Thay \(x = 1\) vào phương trình ban đầu:
  \(3\cdot 1^2 - 2\cdot 1\cdot y + y - 5\cdot 1 + 2 = 0\)
  \(\Leftrightarrow 3 - 2y + y - 5 + 2 = 0 \Leftrightarrow -y = 0 \Leftrightarrow y = 0\) (thỏa mãn)
• Trường hợp 2: \(2x - 1 = -1 \Leftrightarrow 2x = 0 \Leftrightarrow x = 0\) (thỏa mãn)
  Thay \(x = 0\) vào phương trình ban đầu:
  \(3\cdot 0^2 - 2\cdot 0\cdot y + y - 5\cdot 0 + 2 = 0\)
  \(\Leftrightarrow y + 2 = 0 \Leftrightarrow y = -2\) (thỏa mãn)

• Đáp án: She congratulated me on being promoted to senior partner.
• Cấu trúc: congratulate someone on doing something (chúc mừng ai vì điều gì).

• Đáp án: He insisted on paying for the entire meal.
• Cấu trúc: insist on doing something (khăng khăng, quả quyết làm gì).

• Đáp án: The diner complained about his/her main course arriving / having arrived stone cold for the third time that week.
• (Hoặc cách khác ngắn gọn): The diner complained that his/her main course had arrived stone cold for the third time that week.
• Cấu trúc: complain about something hoặc complain that + clause (phàn nàn về điều gì).

• Đáp án: She thanked them for putting her up for the whole fortnight.
• Cấu trúc: thank someone for doing something (cảm ơn ai vì đã làm gì).

• Đáp án: She recommended taking the overnight sleeper rather than the early flight.
• (Hoặc): She recommended (that) I/he/she should take the overnight sleeper rather than the early flight.
• Cấu trúc: recommend doing something hoặc recommend that someone (should) do something (gợi ý, khuyên làm gì).

• Đáp án: She discouraged him from signing the contract until he had read every clause carefully.
• Cấu trúc: discourage someone from doing something (ngăn cản, khuyên ai không nên làm gì).

• Đáp án: He claimed to have personally shaken hands with the Prime Minister on three occasions.
• (Hoặc): He claimed that he had personally shaken hands with the Prime Minister on three occasions.
• Cấu trúc: claim to have done something hoặc claim that + clause (tuyên bố, tự nhận đã làm gì).

• Đáp án: She pointed out that the totals in the second column didn't add up.
• Cấu trúc: point out that + clause (chỉ ra rằng, lưu ý rằng).