Exercise 2: Choose the correct answers 1. Lanspeaks Chinese very well, ? A. does she B. doesn’t she C. is she D. was she 2. John has worked hard, ? A. does he B. did he C. has he D. hasn’t he 3. They invited him to the party, ? A. do they B. don’t they C. did they D. didn’t they 4. They are leaving here tomorrow, ? A. do they B. are they C. aren’t they D. did they 5. I am a bit late, ? A. am not I B. aren’t you C. are you D. aren’t I 6. No one is different to praise, ? A. is one B. isn't one C. is he D. are they 7. Somebody has left these socks on the bathroom floor, ? A. have they B. haven’t they C. has he D. hasn’t he 8. James owns a restaurant, ? A. does he B. is he C. doesn’t he D. didn’t he 9. You aren’t too busy to talk, ? A. are you B. have you C. aren’t D. do you 10. The ticket to London doesn’t cost a lot, ? A. do they B. does it C. is it D. isn’t it

tính Căn 49-12√5 + Căn 49+12√5

Tính `a^3+ b^3` , biết `a + b = 7` và `ab = 3`

Ex2. Rewrite the following sentences that keep the same meaning 1. Although Tom was a poor student, he studied very well. In spite of ______________________________________ 2. Although the weather was bad, she went to school on time. Despite ________________________________________​ 3. My mother told me to go to school although I was sick. In spite of ______________________________________ 4. Tom was admitted to the university although his grades were bad. Despite ________________________________________ 5. In spite of his good salary, Tom gave up his job. Although _______________________________________ 6. He didn’t win an Oscar for Best Actor although he performed excellently. Despite _______________________________________

giúp tóoooooooooooooooooooooooooooooooooooo

giúp mình với ạ!!!xin cảm ơn :333 #phương trình lượng giác cơ bản

Cho 5 chữ số: 1, 2, 3, 6, 7 có thể lập được bao nhiêu số có 3 chữ số khác nhau?

BT: q1=4.10-8C, q2= - 3.10-8 C, q3 = 10-8C, AB =5cm, ε=1. Xác định F tổng hợp do q1, q2, tác dụng lên q3 đặt tại các vị trí sau. a. M là trung điểm của AB. b.N là điểm thuộc AB sao cho: AN = 5cm, BN = 10 cm. c. C sao cho AC = 4 cm, BC = 3cm

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mng giúp e vs ạ ! e sẽ vote 5 sao :3