làm họ mik cái huhu hihi Bài 1 : a,cho các chữ số 0,5,7,9 . Tính tổng của số tự nhiên lớn nhất và số tự nhiên nhỏ nhất có bốn chữ số khác nhau được lập từ các chữ số trên. b, Trung bình cộng của số chẵn lớn nhất có bốn chữ số và số nhỏ nhất có năm chữ số khác nhau là c,Tìm một số có bốn chữ số mà hai chữ số cuối là 19 . Biết rằng nếu xóa đi chữ số 0 ở hàng trăm số đó ta sẽ được số mới bé hơn số phải tìm 1800 đơn vị

Các câu hỏi liên quan

III. Choose the correct answer(s) to complete the sentences. 1. Does she fancy (reads/ reading/ to read/ read) a book to the younger children? 2. They enjoy (garden/ gardened/ gardening/ gardens) on Saturdays. 3. They love (eat out/ eating out/ having eaten/ to eat out) with their friends. 4. I prefer (text/ texting/ texted/ to text) people. 5. My dad doesn’t mind (pick up/ picking up/ to pick up/ picks up) my mom from work every day. 6. No one is able to explain the (beginning/ origin/ reason) of the old customs. 7. There are always regional (differs/ different/ difference/ differences) in every country. 8. (Who/ What/ Which/ When ) of your two sisters is studing in Australia? 9. Although there are cultural (changes/ exchanges/ relations) between ethnic group, they still keep the identity of their own culture. 10. The 54 ethnic peoples of VN are (diverse/ similar/ unlike), but they live peacefully. 11. Which (place/ section/ part) of your country would you most like to live in? 12. Most ethnic minority peoples are good (at/ for/to/on) farming techniques. 13. Chaul Chnam Thmey is the biggest (festival/ ceremony/ practice) of the Khmer people. 14. The US is (a/an/the/0) multi-cultural country with over 80 ethnic groups. 15. So many people nowadays are (addicted to/ bored with/ worred about/ afraid of) computers and mobile phones. They use them a lot. 16. (Sports/ Leisure activities/ Riding a bike/ Flying a kite) can make you relaxed. You enjoy them in your free time. 17. The volunteers have to work much (as hard as/ more hard than/ harder than/ the hardest) usual to save the dying animals from the forest fire. 18. In 2010, Ha Noi (celebrated/ commemorated/ worshipped/ remembered) its 1000th anniversary. 19. The (preservation/ procession/ performance/ song) of quan ho singing has been recognized as a world heritage. 20. Tet is an occasion for family (visitings/ gatherings/ reunions/ seeings) in Viet Nam.