Câu 1: a. CMR; 10^2011+8 chia hết cho 72

b. CMR: Hai số lẻ liên tiếp bao giờ cũng nguyên tố cùng nhau

Câu2:

a. Tìm số tự nhiên nhỏ nhất sao cho số đó chia cho 3 dư 1 , chia cho 4 dư 2, chia cho 5 dư 3 , chia cho 6 dư 4 và chia hết cho 11

b. Tìm các số tự nhiên x,y thỏa mãn: X^2 +2.x.y=100

c.Tìm số tự nhiên n biết 5n+7 chia hết cho 3n+2

Nhờ mọi người gúp e vs ak, nhanh giùm ak, Thanh you!!!

* Chỉ cần xác định ô trống cần danh từ, động từ, tính từ, trạng từ hay là giới từ thôi nha. Không cần phải chia từ đó ( nhanh lên giùm mình với nha )

1. Bao is very _________, kind and generous. ( social )

2. Each of my friend has a ______ character. ( difference )

3. We are good friends although each of us has a different _________. ( characteristic )

4. He spends most of his time doing charity work. He’s a ________ man. ( social )

5. He has a sense of _______ because he often tells jokes. ( humorous )

6. Nam makes friends very _________ because he is very sociable. ( ease )

7. Hoa is very _______.She doesn’t talk to anybody in her class. ( reservation )

8. A ( n ) _________ is a child who lost his parents. ( orphanage )

9. They were very ________ to survive a fire. ( luck )

10.Nga often helps poor and homeless people. She is ______ . ( generosity )

11. _______, her sister passed the driving test. ( luck )

12.My uncle often spends his free time doing volunteer at a local _______. ( orphan )

13.I love the ________ of the summer evenings in the countryside. ( peaceful )

14.My father is loved by his colleagues because of his sense of _______. ( humorous )

15.A child whose parents have died is called an ________. ( orphanage ) 1

6.An _______ is a home for children whose parents were dead. ( orphan )

17.I find him quite ________ in class. ( reserve )

18.I think learning a language is very ________. ( interest )

19. She gets ________ when people smoke in the restaurants. ( annoy )

20.It was ________ that she didn’t go to school. ( surprise )

21.He always does his homework ___________. ( careful )

22.I can do all of these exercises _________. ( ease )

23.Her sister plays the violin very __________. ( beautiful )

24. Paul works very ________ in his new job. ( hard )

25. She looks _________ because she gets good mark. ( happiness )

26.I find it ________ for me to answer her question. ( difficulty ) 

giải giùm mk với ak