Cho: 

a.  A = 5 . 4 15 . 9 9 - 4 . 3 20 . 8 9 và  B = 5 . 2 9 . 6 19 - 7 . 2 29 . 27 6

Tính A:B

b.  C = 2181 . 729 + 243 . 81 . 27 và  D = 3 2 . 9 2 . 243 + 18 . 243 . 324 + 723 . 729

Tính C:D

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

Immediately, after his arrival, things went wrong.

A. No longer did he arrive, but things still went wrong

B. When he was arriving, things went wrong

C. Because he arrived, things still went wrong

D. No sooner had he arrived than things went wrong

C₂H₂ → A → B → m-bromnitrobenzen. A và B lần lượt là

A. Benzen; nitrobenzen

B. Benzen, brombenzen

C. Nitrobenzen; benzen

D. Nitrobenzen; brombenzen

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each of sentences in the following questions.

She helped us a lot with our project. We couldn't continue without her.

A. Unless we had her contribution, we could continue with the project.

B. But for her contribution, we could have continued with the project.

C. If she hadn't contributed positively, we couldn't have continued with the project.

D. Provided her contribution wouldn't come, we couldn't continue with the project.

She agreed that all the present paperwork _____ for everyone to have more time to socialize.

A. stopping

B. be stopped

C. to stop

D. stopped

Ghép các ô có giá trị bằng nhau:

Cho điểm M(5;2) và đường thẳng (d): 3x – y + 2 = 0. Tìm ảnh của M qua phép đối xứng qua đường thẳng (d)

A. (–5;4)

B. (5;4) 

C. (4;5)

D. (–4;5)