a. Các sinh vật cùng loài hỗ trợ và cạnh tranh với nhau trong những điều kiện nào? Quan hệ giữa các cá thể trong hiện tượng tự tỉa của thực vật là mối quan hệ gì? Trong điều kiện nào hiện tượng tự tỉa diễn ra mạnh mẽ. b. Trong thực tế sản xuất cần phải làm gì để tránh cạnh tranh gay gắt giữa các cá thể sinh vật, làm giảm năng suất vật nuôi và cây trồng?

Tìm tất cả các giá trị của m để f(x) ≥ 0 có nghiệm đúng với mọi x thuộc [-3;2] (biết f(x) = x^2 - 2x - m )

cho tam giác abc có các góc đều nhọn các đường cao ad, be ,cf cắt nhau tại h . a. cm ae.ac=ah.ad b. cm tam giác afe đồng dạng acb giúp mk với ạ !!!!!

Viết CT nhập vào số N (n>0).in ra màn hình tất cả các ước nguyên dương của N và tính tổng các ước đó

I.Choose the word that has a different sound in the underlined part. 1.A. marble B. start C. smartD. solar 2. A. hearB. clear C. bear D. fearII. Choose the best answer (A, B, C or D) to complete each sentence. 3. Next week, he visit Eiffel tower in Paris. A. does B. did C. will D. is 4.the film is late, we will wait to watch it. A. Because B. Although C. Therefore D. However 5.My father first Thailand in 2020. A. visited B. will visit C.visits D.is visiting 6. Her sisterhome for school yet. A. didn’t leave B. don’t leave C. hasn’t left D. isn’t leaving

Theo như bạn biết, hiện nay có rất nhiều nguồn thông tin khác nhau và chỉ cần tìm tên 1 chủ đề thì sẽ hiện ra vô vàn những kiến thức về nó, vậy bạn sẽ chọn lọc nội dung như thế nào ? - Ví dụ cùng là một câu hỏi nhưng ở trang web này cho ra kết quả khác, trang web kia lại cho kết quả khác. Vậy bạn sẽ xử lí như thế nào ?

Giúp vs ạ .❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️

Find the word whose underlined part has a different sound from that of the other ones. checked stopped cleared laughed

một người đi xe đạp từ A đến B với vân tốc 15km/h . Lúc về người đó đi vơi vận tốc 12km/h ,nên thời gian về lau hơn thời gian đi là 30p . Tính SAB =?

II. Find the word which has a different sound in the part underline. 1. A. prefer B. better C. teacher D. worker 2. A. bear B. hear C. dear D. near 3. A. collect B. concern C. concert D. combine 4. A. absent B. government C. dependent D. enjoy 5. A. future B. return C. picture D. culture III. Match the noun from the box with the correct. 1. go: 2. do: 3. collect: 4. play: 5. take: 6. watch: IV. Put one of the verbs from the box in each blank with the correct form. 1. The children are a play at the end of term. 2. When did you start antique glass? 3. What kind of music do you to? 4. Irene won’t be able in the match on Saturday. 5. I’ve never skiing. 6. He spent a pleasant afternoon the book. V. Complete the sentences with the words in the box. 1. I really like - especially in the sea. 2. I’m interested in . My favourite band is T-ara from Korea. 3. I love . I go to the cinema every weekend. 4. I really like . I don’t play it, but I watch matches on TV. 5. My hobby is . I have a new camera. 6. I love . My favourite writer is To Hoai. 7. I really love in the park with my friends. 8. I like . I play against my dad. I also play against other people on the Internet. VI. Put the verbs in brackets in the correct verb form. 1. Nam’s friends often (give) him stamps from other countries. 2. My sister (practise) the guitar twice a week. 3. I (see) a film this Sunday evening. (you/ go) with me? 4. They (give) a party next week. 5. The members of the stamp collectors’ club (meet) at the library next Friday. 6. (you/ be) free next Sunday. 7. We (live) near Nam’s house, but we (not see) him very often. 8. Don’t worry. I (go) fishing with you next Saturday morning. VII. Write the name of the hobbies from the box into each blank according to the description. 1. At first, people preferred to collect by country. They chose one topic in their own country. Nowadays, people enjoy collecting in topics from several countries. The most favourite themes are sports, art and music, birds and flowers, etc. 2. Many people enjoy this hobby because they have a close contact with outdoors, exercise, and nature. They also gain a knowledge of insects. 3. Today this hobby becomes very popular in the world. For many people, it is a form of exercise and an enjoyable leisure activity. With a little soil, some seeds, and a few basic tools, people can enjoy creating a beautiful thing and watching it grow. VIII. Complete the text with the verbs in the box in the correct form. Maybe some verbs can be used more than once. John has a lot of hobbies. He (1) chess at school and he also (2) skating. After dinner, he (3) for a walk and he (4) to music every evening in his room. John loves sports. He (5) athletics at school, and he (6) football after school. On Saturdays, John and his friends (7) swimming. On Sundays, they (8) basketball in the park. On Sunday evenings, they sometimes (9) a film. IX. Write questions for the answers. 1. A: Where on holiday? B: I like going to the mountains on holiday. 2. A: Who at school? B: I like sitting next to my friend Jack at school. 3. A: What kind to? B: My friends like listening to rap music. 4. A: What on Sunday evenings? B: I enjoy going to the cinema. X. Rearrange the sentences to make a suitable conversation by writing the correct number in the box.  Those are posters of my favourite singers.  Singers? They’re very nice. Thank you.  They’re my favourite T-shirts.  Hi. Tell me about your collections. What are these?  Oh, they’re interesting. And what are those? XI. Choose the correct answer A, B, c or D to fill each blank in the following passage. Coin collecting is one of the most popular hobbies in the world. Most coin (1) enjoy trying to have a complete set of a country’s coins. Some people collect coins for pleasure; (2) collect coins in order to sell them later. From coins, we can also (3) something about certain famous people and events in a country’s (4)______. Many beginning collector go to the bank and buy coins. Then they (5) coins for their collection. 1. A. collectors B. collecting C. collected D. collections 2. A. another B. other C. others D. the other 3. A. teach B. learn C. give D. offer 4. A. history B. nature C. science D. geography 5. A. look B. see C. watch D. find