Cho tam giác ABC vuông tai A, trung tuyến AD, CE a) Chứng minh AEDC là hình thang b) Goi F là điểm đối xứng với D qua E. Chứng minh AFBD là hình thoi Giúp mình với a đang cần gấp

a) 3x.(3x^2-5x-7) b)( 25x^4-20x^2.y^3-5x^5.y):(-5x^2) c) (x+y)^2+(x-y)^2-2x^2

IV/ Tìm lỗi sai và sửa lại cho đúng ( khoanh chọn A, B, C, D) 61. I LOVE DRINK coffee BECAUSE it helps me STAY awake. A B C D 62. She HAVEN'T finished READING ANY books YET. A B C D 63. MY hobby IS AS exciting WITH their hobbies. A B C D 64. She FINDS CARVING wood IS really BORING. A B C D 65. All DISHES IN this restaurant TASTES DELICIOUS. A B C D

Minh có đọc cách giải của 1 bạn như này, nhưng mình thắc mắc tại sao từ phân số lại ra 22:12:11

11. She does many exercises. He gets healthy. ……………………………………………………… 12. The air is polluted. Diseases are great. ………………………………………………………… 13. We went far. We felt tired. ………………………………………………………………………. 14. The soil was poor. The famers tried hard. ……………………………………………………….. 15. The bread is bad. It is cheap. ……………………………………………………………………. 16. Peter is old. He is clever. ………………………………………………………………………… 17. The lesson is difficult. We tried hard. …………………………………………………………… 18. He talked a lot. We disliked him very much. ……………………………………………………. 19. If you eat much vegetable, you will feel healthy. ………………………………………………………………………………………………………… 20. The workers built roads. They needed a lot of equipment. ………………………………………………………………………………………………………… 21. There is much co-operation. We can recycle a lot of waste papers. ………………………………………………………………………………………………………… 22. He thought about his family. He felt homesick very much. ………………………………………………………………………………………………………… 23. Tom wrote more. His writing was becoming better. ………………………………………………………………………………………………………… 24. He became poorer because he spent too much money. ………………………………………………………………………………………………………… 25. We read this book carefully. We understand it well. …………………………………………………………………………………………………………

kể 2 câu ca dao về siêng năng kiên trì

IV. Combine these pairs of sentences into one, using the double comparative clauses : 1. The sun is high. The shadow is short. …………………………………………………………… 2. He works a lot. He earns much. ………………………………………………………………… 3. He works little. He will be paid little. …………………………………………………………… 4. It is heavy. It becomes expensive. ………………………………………………………………. 5. She eats little, she becomes thin. ………………………………………………………………… 6. He talked much. I became bored. ……………………………………………………………… 7. I waited long. I got angry . ……………………………………………………………………… 8. You are old. You understand more. …………………………………………………………… 9. She drove fast. I became nervous. ……………………………………………………………….. 10. We ran fast to go home. The sky went dark. ……………………………………………………..

Ư(30) lm nhanh Ư(10) B={ x thuộc N / 63 chia hết cho x, 102 chia hết cho x , x > ư }

cho hàm số y=(m-2)x+n(d) . Tìm m,n biết a)(d) đi qua 2 điểm A(-1;2) và B(3;-4) b) (d) cắt trục tung tại điểm có tung độ bằng 1- √2 và cắt trục hoành tại điểm có hoành độ bằng 2+ √2 c) (d) trùng với (d'): y=2x-3

Em hãy viết đoạn văn (từ 6-8 câu) trình bày suy nghĩ của em về tình đoàn kết (Viết đúng số câu 8 câu lố xíu cũng ko sao, ko chép mạng nha)