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vananh79nd
2 năm trước
tính các tổng sau A= 1/2+1/6+...+1/9900 B= 1/1.5+1/5.9+...+1/2018.2020 C= 1/10.12+1/12.14+...+1/998.1000 giúp mk với mai mk nộp rồi mọi người giúp mk với ạ
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Read the text and choose the correct option. The railway system in Viet Nam was first built in 1899, when Viet Nam was still a French colony. The total (1)______ of the railroad is over 3,000 km, with the main route being the North-South (2)______, which is 1,726 km long. Thì track was considered the backbone of Indochina at the time. Now, the rail system (3)_____ 35 out of the 63 cities and provinces of Viet Nam. However, the system was (4)______ damaged by bombings during the war. In 1975, after the reunification of the north and the south, the Vietnamese government decided to (5)______ the system. In the space of a year, hundreds of bridges, tunnels, and stations were restored, along with 660 km of tracks. The new and improved system was (6)______ the Thong Nhat Express. 1. A. long B. length C. wide D. will 2. A. Railway B. Road C. Route D. Way 3. A. uncovers B. discovers C. covers D. stretches 4. A. seriously B. importantly C. seriou D. very 5. A. build B. restore C. grow D. upgrade 6. A. recalled B. know C. considered D. renamed Answer the questions 1. When was the railway system in VietNam first built? 2. Was the system seriously damaged by bombings during the war?

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