Tìm giá trị nhỏ nhất của :

\(\frac{x^2+4x+12}{\left(x+1\right)^2}\)

Read the passage below and choose one correct answer for each question.

Television is an important invention of the 20^th century. It has been so popular that we can't imagine what life would be like if there were no television. Television is a major means of communication and entertainment. It brings pictures and sound from around the world into millions of homes. Through television, viewers can see and learn about people, places and things in distant lands. Television widens our knowledge by introducing new ideas which may lead us to new hobbies and recreations. In addition to the news, television provides us with a variety of programs that can satisfy every taste. Most people now seem to like spending their evenings watching television than to go out.

When was television invented?

A. 20th century 

B. 21st century 

C. last decade 

D. few years ago

Số tâm đối xứng của đường tròn là

A. 1

B. 2

C. 3

D. 4

Thay a bằng chữ số thích hợp để số 5a27 chia hết cho 9.

A. a =  0

B. a =  2

C. a =  4

D. a =  9

Phương trình 3 2 x + 1 - 28 . 3 x + 9 = 0  có hai nghiệm là x 1 , x 2 x 1 < x 2 .  Tính giá trị T = x 1 - 2 x 2

A. T = -3

B. T = 0

C. T = 4

D. T = -5