Cho hàm số y = sin x - cos x + 1 sin x + cos x + 2 . Giả sử hàm số có giá trị lớn nhất là M, giá trị nhỏ nhất là m. Khi đó giá trị của M+m là

A. 2

B. 4

C. 0

D. 1

Số hạng không chứa x trong khai triển x 2   +   4 x 20 ,   x   ≠   0 bằng: 

A .   2 8 . C 20 12

B .   2 9 . C 20 9

C .   2 10 . C 20 10

D .   2 10 . C 20 11

1. know---> known

2.times--> time

3.would--> will

4. where is located---> which is located

1. the course begins ........on...........2 January, and ends sometimes ........in.......April

2 the children aren't here at the moment, but they'll be back ....in............... a few minutes

3. we're having a party ....on..........New year's Eve. Can you come ? I'm afraid I can't. I don't like going out .......at........night

4. shall we go now? no, let's wait .......untill.............it stops raining

5. i've got an interview next week. it's ..........at..........9.30......in............tuesday morning

6. bill has worked in this company.....for....five years......since........he graduated from Boston University

7. it rained......in....... the night ......for...... two or three hours

1. These shirts were expensive so she couldn't buy them

2. A new school has been built in this city

3. The date of the meeting has to be changed

4. Hoa finished her work late, because she didn't have time

5. She used to wear the ao dai last year

6. He buys this book because it is cheap

1. C. Carefully

2.B. Were

3.A. Doesn't come

4.C. Although

5.C. Happily

6.B. Having

7.D. which