Câu 7: Một lò xo treo vật m1 thì dãn một đoạn x1, cũng lò xo ấy khi treo vật m2 thì dãn đoạn x2. Biết m1 < m2, hỏi cơ năng của lò xo ở dạng nào ? Trường hợp nào có cơ năng lớn hơn ? Vì sao ?

Bài 1. Chứng tỏ các phương trình sau vô nghiệm: a, 2x+5=4.(x-1)-2.(X-3) b, 2x-3=2.(x-3) c, |x-2|=-1 d, x ²-4x+6=0 Giusp hộ nhé mn quà j tui tặng.

dựa vào đâu mà ng ta bt đc các loại tế bào khác nhau ( tế bào rễ, tế bào nhân, tế bào lá...) thì có hình dạng và kích thước khác nhau?

1.Although Henry is a millionaire, he hates spending money. (despite) 2 Alaska is perhaps the most .... state in the USA. It has over three million lakes. A.puzzling B.festive C.amazing 3 Australia is composed of seven ............ A.nations B.countries C.states

sin(90-x)+cos(180-x)+sin^2x(1+tan^2x)-tan^2x

Câu 6: Xác định câu ghép trong những ví dụ sau, chỉ ra các quan hệ ý nghĩa giữa các vế câu: a. “Con đường này tôi đã quen đi lại lắm lần, nhưng lần này tự nhiên thấy lạ. Cảnh vật chung quanh tôi đều thay đổi, vì chính lòng tôi đang có sự thay đổi lớn: Hôm nay tôi đi học”. b. “Tôi lắng nghe tiếng hai cây phong rì rào, tim đập rộn ràng vì thảng thốt và vui sướng, rồi trong tiếng xạc xào không ngớt ấy, tôi cố hình dung ra những miền xa lạ kia. Thuở ấy chỉ có một điều tôi chưa hề nghĩ đến: ai là người đã trồng hai cây phong trên đồi này?...”

Làm hộ mình bài 1 với ạ Thank nhiều

Câu 6: Hãy chỉ ra sự chuyển hóa năng lượng trong các trường hợp sau: a. Nước chảy từ trên đập cao xuống. b. Ném một vật lên cao theo phương thẳng đứng. c. Chong chóng quay. d. Học sinh dùng chân đá quả bóng đập vào cột cầu gôn và bật ra.

VII. Read the passage, and choose the correct answer A, B, C or D for each question. World BBQ To some people, there is nothing more appetizing than the smell of meat sizzling over an open fire. Throughout the world, people love to eat barbecue because it lets them together with friends and family to enjoy a meal that brings them back to their caveman roots. Cooking over coals or an open flame makes people feel more sociable. Most countries have barbecue traditions, and they usually take place on national holidays. In the United States, it is a tradition to have a barbecue of hamburgers and hot dogs on July 4, which is Independence Day. In Taiwan, people get together to eat barbecue during the Moon Festival, and the smell of burning coal is in the air all day. In South America, and in Argentina in particular, barbecue is a way of life. All sorts of meats and sausages are put on a large grill together over hot coals. Barbecue is even considered the national dish in Argentina, and it is given the name asado in Portuguese. This means not only the dish, but also the social event that surrounds an Argentinian barbecue. When a person speaks about Turkish and Middle Eastern barbecue, the kebab immediately comes to mind. The tradition of taking different meats, and sometimes vegetables as well, and spearing them with a sharp stick called a skewer has crossed cultural lines today. Practically anywhere in the English-speaking world, the thought of shish-kebab will make barbecue lovers’ mouths water. Wherever you go in the world, you are almost certain to come across a local method of preparing barbecue. If you visit different places, be bold and try whatever the local specialities are. 36. What does the phrase “brings them back to their caveman roots” in paragraph 1 mean? A. Make people want to eat barbecue on an open flame B. Keep people from eating meat C. Make people think about how things were with their ancestors D. Cause people to act more sociable during festivals 37. Where is barbecue considered a way of life? A. The United States B. Taiwan C. The Middle East D. Argentina 38. What are the sharp sticks that are used to cook meat called? A. Specialities B. Skewers C. Shish-kebabs D. Asado 39. Which of the following statements is NOT true? A. Cooking over open fires makes people feel less sociable. B. Shish-kebabs are well-known in Turkey. C. People in the United States eat hamburgers and hot dogs. D. Argentina’s asado is considered the national dish. 40. What is the main idea of the passage? A. Barbecue is a healthy way to eat meat. B. People today are eating more vegetables with their barbecue. C. Local barbecue specialities can be found all over the world. D. People in some countries mostly use sausages when they barbecue. VIII. Write complete sentences about healthy eating habits, using the words/ phrases given in their correct forms. You can add some more necessary words, but you have to use all the words given. 46. We/ eat/ only/ much food/ as/ body/ need. 47. Moderation/ key/ any healthy diet/ and/ it/ also/ mean/ balance/ our diet. 48. Cutting down/ your intake/ sugar/ or/ salt/ help/ you/ prevent/ several problems/ disease. 49. You/ eat/ only when/ you/ active/ during daytime/ and/ avoid/ eat/ night. 50. If/ you/ work/ feel hungry/ you/ healthier snacks/ such/ fruits or vegetables.  

cho mình hỏi con đỉa và con rận. con nào trong vòng đời hút nhiều máu hơn