Rút gọn biểu thức : C=/x-3/ +/2x+3/ -x -7

Trung bình cộng của hai số là số lớn nhất có hai chữ số, biết số thứ nhất là 69. Tìm số thứ hai.

Put words in correct form:
1. I’ve never visited such a clean and ______________beach like this before. (SPOIL)
2. The ______________________work of these buildings could take a pretty long time. (RENOVATE)
3. It was one of the most ________________________news of the year. (SENSATION)
4. __________________has become a big concern for many countries in Asia. (DEFOREST)
5. This wall was first built by the local government for __________________purposes. (DEFEND)
6. There are many ___________________events at the site of the festival. (CULTURE)
7. Visiting Phong Nha – Ke Bang caves and witnessing the magnificent creation of mother nature was truly an ____________________ experience. (FORGET)
8. Khai Dinh tomb is _________________in most travel itineraries of Hue ancient city. (RECOMMEND)
9. The slow features six _____________________ from different parts of the country. (CONTEST)
10. Chua Keo (in Thai Binh Province) is a _____________ pagoda which was built about 400 years ago. (WOOD)
11. The hotel is _________________________ located in the centre of the city.​ ​(BEAUTY)
12. There are many _________________________ to Cam Ly Waterfall every year.​ (VISIT)
13. Can you give me the ________________________ map of the country?​ ​(GEOLOGY)
14. She saw him pass by without a sign of __________________________.​ ​(RECOGNISE)
15. Get to the mountain top to get the best ________________________ view of the city. (PICTURE)