Chứng minh nếu a là số nguyên thì: a)M=a(a+2)-a(a-5)-7 chia hết cho 7. b)N=(a-2)(a+3)-(a-3)(a+2) là số chẵn.

Bài 6. Khoanh tròn vào phương án đúng. 1. I (would buy/ bought) a new house if I had enough money. 2. If he (would try/ tried) his best, he might be successful. 3. If I (lived/ would live) in Japan, I could speak Japanese well. 4. If someone gave you a dress, which color (would you want/ you would want) it to be? 5. I would repaired the roof myself if I (would have/ had) a longer ladder. 6. You would be more comfortable now if you (didn’t/ wouldn’t) wear high heels. 7. I (wouldn’t/didn’t) buy things on the Internet if I were you. 8. If you (met/ would meet) your favorite author Mark Twain, what wouldn’t you ask him? 9. His parents would be very proud if he (wouldn’t be/ weren’t) so naughty. 10. If Jane had more money, she (would treat/ treated) herself to a decent meal. 11. If you were a billionaire, what (would you do/ did you do)/ 12. If Kate owned a computer, she (would spend/ spent) most of her free time on it. 13. If I (would know/ knew) his address, I would give it to you. 14. She would look much better if her hair (didn’t look/ wouldn’t look) so unkempt. 15. If I were in your situation, I (would/ will) let the nature take its course. Bài 7. Hoàn thành các câu sau, sử dụng dạng đúng của động từ trong ngoặc. 1. More tourists would come to our country if we (provide) ______________ better services. 2. If I studies abroad, _____________ (we/keep) in touch with each other? 3. If someone (give) ______________ you a camera, what would you do with it? 4. If I (win) _________________ a big prize in a lottery, I (donate) _______________ apart of it and (spend) _______________ the rest for myself. 5. What ___________ (you/do) if you found a wallet in the street? 6. I could watch foreign TV program without subtitles if I (know) _________ English. 7. He might be obese if he (not stop) __________________ taking in fat and sugar. 8. If he knew that it was dangerous, he (not do) _______________ it. 9. If you (see) ________________ someone drowning, ________________ (you/save) him? 10. She (be) __________________ happier if her parents (not get) ________________ divorced. 11. If you (sleep) _____________ under a mosquito net you (not be) _______________ bitten so often. 12. I (get) _________________ a job easily if I (have) ______________________ a degree. 13. If whe (have) _________ another hair style, she (look) ___________ younger. 14. if the weather (not be) _______________________ severe, out crops (grow) _______________ faster. 15. I (keep) _____________ a horse if I could afford it. Bài 8. Viết câu điều kiện loại 2 cho các trường hợp sau. 0/ They don’t have enough money. They cannot buy a new car. ->If they had enough money, they could buy a new car. 1. There isn’t a library in my neighborhood. I cannot borrow books. __________________________________________________________________________________ 2. My health is not good. I don’t play extreme sports. __________________________________________________________________________________ 3. We cannot go for a picnic because it is pouring with rain. __________________________________________________________________________________ 4. I don’t have much free time. I cannot come to your party. __________________________________________________________________________________ 5. Jim doesn’t have any siblings. He feels lonely sometimes. __________________________________________________________________________________ 6. My father is very busy at work. He rarely has time for me. __________________________________________________________________________________ 7. This camera is expensive. I can’t buy it. __________________________________________________________________________________ 8. You don’t try your best. Your result will not be good. __________________________________________________________________________________ Làm hộ mình hết nha

Nghiệm của phương trình 4(3x−2)−3(x−4)=7x+20 là x=a . Chọn khẳng định đúng.

V - Combine each pair of the sentences, using the adjective + to-infinitive/ noun clause structures. 11. Thu is happy. She wins the competition again. 12. The students learn how to recycle waste paper. They are very excited. 13. Watching the circus on television is funny. 14. Phong is anxious. He‘s moving to a new school. 15.The children are going on a trip to the seaside. They are very delighted. 16. Riding your bike fast is dangerous. 17. She heard sad news from her friend. She was so unhappy. 18. Lan and Lien are reporting a book on wild animals next week. They are very eager. 19. Phong got bad results in this semester. He was so disappointed. 20. Eating too much sweet and fat is not good for your health. mn giúp em vs ạ

Cho tứ giác ABCD có AC vuông góc BD. Gọi E, F, G, H lần lượt là trung điểm của AB, BC, CD, DA a) Tứ giác EFGH là hình gì?Vì sao? b) Tính diện tích tứ giác EFGH,biết AC=6cm,BD=4cm c) Cần thêm điều kiện gì về 2 đường chéo để EFGH là hình vuông?

Make sentences from the given words. 26. My Tam’s/ live show/ Lan Anh Stadium/ on TV/ next week. …………………………………………………………………………………………………… 27. The Voice Kids/ popular/ programme/so/ our children/ love/ very much. …………………………………………………………………………………………………… 28. The/ news programme/ on/ VTV3/ 7 p.m/ everyday. …………………………………………………………………………………………………… 29. We/ like/ watch/ cartoons/ TV/ because/ they/ interesting. …………………………………………………………………………………………………… 30. My brother/ weatherman./ He/ on TV/ everyday. …………………………………………………………………………………………………… giúp mình với ạ

Ai giúp em làm đi ạ em xin mn đấy🙏🙏🙏

Giải bài tập hình học câu 3 câu 4 trên ảnh giúp ạ

Nối lại giúp mình nha đg cần gấp

Làm hộ mình vs ạ Thanks mn rất nhiều