Cho hàm số f x = 12       x ≥ 9 a x − 2 b − 12 x − 1 3 − 2      x < 9 .  Biết rằng a, b là giá trị thực để hàm số liên tục tại x 0 = 9.  Tính giá trị của P = a + b

A.  P = 1 2

B. P = 5

C. P = 17

D.  P = − 1 2

Cho hàm số f(x) thỏa mãn ( f ' ( x ) ) 2 + f ( x ) . f ' ' ( x ) = 15 x 4 + 12 x ,   ∀ x ∈ R  và f ( 0 ) = f ' ( 0 ) = 1  Giá trị của f 2 ( 1 )  bằng

A. 8

B. 9/2

C. 10

D. 5/2

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase for each of the blanks.

Language is considered a significant (31)_________ of communication in international relations. People in modern world have no longer been bound to their own countries. Moreover, in keeping (32)________ with speedy scientific developments nowadays, they must widen their (33)_________ relations with those highly developed nations in other parts of the world, owning to the fact that no one is able to (34)_________ with any natives in the world, it is necessary for people to choose to learn a foreign language as a word-wide common means of communication (35)______ their own mother tongue or native language. That is why English has been chosen by most people to be a foreign language to master. More and more people use English and the number of those who lean English as a foreign language has been increasing so rapidly that it has outnumbered that of any other.

Question 33

A. cooperative

B. conflicting

C. hostile

D. diplomatic