Tổng tất cả các điểm cực đại của hàm số y=cosx+2017 nằm trong khoảng [ 0 ; 2 π ]  là

A.  2 π

B.  π 2

C.  π

D.  3 π 2

Choose A, B, C, or D that best completes each sentence.

She got up late and rushed to the bus stop.

A. came into

B. went leisurely

C. went quickly

D. dropped by

Read the following passage and answer the questions

Rita is from Canada, but she lives in Ho Chi Minh City. She works in a hospital. She has a car and usually drives to work. She leaves home at eight and starts work at half past eight. She likes her job, but she likes the weekend, too. On Saturdays, she plays tennis or goes swimming. She sometimes goes jogging, too. On Sunday evenings, she always eats in a restaurant with her friends.

When does she play tennis?

What is the price of a kilo of beef?

⇒ How ……………………………………………………………………

Cho  mặt  phẳng ( α )  đi qua điểm M(1; –3;4) và song song với mặt phẳng  ( β ) : 6x + 2y – z – 7 = 0. Phương trình mặt phẳng  ( α ) là :

A. 6x + 2y – z +8 = 0

B. 6x + 2y – z +4 = 0

C. 6x + 2y – z – 4 = 0

D. 6x + 2y – z – 17 = 0

Sự sống chuyển từ dưới nước lên ở cạn vào:

A. Kỉ Cambri

B. Kỉ Đêvôn

C. Kỉ Than đá

D. Kỉ Silua

Phần tự luận

Nội dung câu hỏi 1

Cho phương trình x 2 - 2(m + 3)x + m 2  + 3 = 0

a) Tính Δ'