Giải phương trình:

||2x- 1| +1/2 |= 4/5

Cho 2a + 3b = 7

CMR: 2a² + 3b² >= 49/5

Giúp e với mng. E đang cần gấp

Một tb sinh dục chín của ruồi giấm đực có kí hiệu bộ NST là AaBbđXY. Hãy xác định kí hiệu có thể có tại kì giữa I của bộ NST theo nhiều cách khác nhau.

Trong tế bào sinh dưỡng của 1 loài mang các gen A, a, B, b, D, d.

Hãy xác định kiểu gen có thể có của tế bào đó?

Cho A= (3x-1)/ (x+5)

B= 2/ √x +3 (x≥0)

a) Tìm x∈ Z để A,B có giá trị nguyên

b) Tìm x để A,B có giá trị âm

■ Sử dụng từ trong ngoặc để viết lại những câu sau sao cho nghĩa không đổi:
1. It was such a boring film that we left in the middle.
=> It was............ we left in the middle. (so)
2. No one knows why they are emigrating.
=> No one knows.......... emigrating. (for)
3. Our car broke down so we were very late.
=> Our car broke down........... very late. (consequently)
4. She was so insistent that we couldn’t ignore her.
=> She was............ ignore. (too)
5. They couldn’t go to the post office because of a snowstorm.
=> They couldn’t go to the post office............. snowstorm. (as)
6. She had a very bad night’s sleep, so she was exhausted.
=> She had a very bad night’s sleep...........she was exhausted. (result)
7. Do you know the reason for her leaving her job?
=> Do ............. her job? (why)
8. The coffee was so strong that I couldn’t drink it.
=> It ........... that I couldn’t drink it. (such)
9. He was such a skillful player that he seldom lost a game.
=> He was ............. he seldom lost a game. (so)
10. He didn’t get the job because he was inexperienced.
=> He didn’t get the job ....... experience. (to)

19. We were very tired last night because we (play)....football in the afternoon.

20. Linda wasn't at home then. If she (be).... at home, I (visit).... her.

21. I (meet) .... him twice before I (leave) .... for London.

22. When we (come).... to the movies, the film already (begin)....

23. After I (finish).... my breakfast, I (get)..... ready to go to school.

24. If I (not/ be)..... buzy, I would have come.

25. He (leave).... his office after he (read).... the report.

26. He (go).... to the railway station yesterday morning but the train (start)....

27. The manager already (leave) ..... for the conference before we (get)... to the office.

28. If we (meet).... Lan, she wouldn't have been unhappy.

29. I didn't meet Sleve because when I (arrive)...., he (go) .... to school.

30. This room (paint).... since the last time I (be) ..... here.

31. If you had finished it yesterday, you (not/ have).... to come back.

32. Miss Snow (type)... ten letters before lunchtime yesterday.

33. The train (start)..... before we (arrive)..... at the station.

34. The film already (begin).... when we (get).... to the cinema.

35. He said that he (see)... that man before.

36. Mr Brown (die).... after he (be).... ill for a long time.

37. By December 1st last year, he (work)...... in the bank for 5 years.

38. He discovered to his horror that he (eat)..... a fly.

39. He (do).... nothing before he (see).... me.

40. I realised that I (see)..... that woman before.

1. When the telephone rang. I just (finish) my homework.

2. Peter's father had his ole bicycle (repair).

3. When we (come) Tom already (have) dinner.

4. After she (finish) her work, she (leave) the office.

5. As soon as it (stop) raining the workers went on with their work.