Rút gọn biểu thức   x - y 2 y x y 2 x - y 2 với x > y > 0 ; ta được kết quả:

A.  x 2

B. x y 2

C. - x 2

D. - x y 2

Read the following passage about Hoi An and answer the questions below:

The ancient town of Hoi An lies on the Thu Bon River, more than 30 kilometers to the south of Da Nang. Occupied by early western trades, Hoi An was one of the major old-time commercial ports of South Asia in the 16th century. Hoi An is famous for old temples, pagodas, tiled-roof houses and narrow streets. Tourists can visit the relics of Sa Huynh and Cham Civilizations. They can also enjoy the beautiful scenery of the Thu Bon River, Cua Dai Beach, etc. In recent years, Hoi An has become a very popular tourist destination in Viet Nam. Importantly, the committee of the World Heritages of UNESCO officially certified Hoi An a World Heritage Site in 1999.

What can tourists visit in Hoi An?

……………………………………………………………………………………………

Theo Hiến pháp 1889, thể chế chính trị của Nhật Bản là

A. cộng hòa đại nghị.

B. quân chủ lập hiến.

C. quân chủ chuyên chế.

D. cộng hòa tổng thống.