Mong mọi người giải giúp mình ạ!

để tạo lập 1 vb, vd như viết thư, trước tiên phải xác định rõ 4 vấn đề: viết cho ai? Viết để làm gì? Viết để làm gì? Viết ntn? Bỏ qua vấn đề nào trong 4 vấn đề đó cũng k thể tạo ra 1 vb

Cho pt (2cosx-1)(2cos2x+2cosx-m)=3-4sin^2x. có bao nhiêu giá trị m nguyên âm lớn hơn -10 để pt có 2 nghiệm thuộc đoạn [-pi/2;+pi/2]

+Tìm 1 số , biết rằng 5/9 của số đó bằng 4/7 của -1260: +Số đối của phân số -2021/-2022: +số nghịch đảo của 7/5:

Ex 6: Put a word from the box in each gap to complete the following passage. fresh drink eat rice healthy school water fish breakfast well It’s important to (1)……………………..well, especially when you are studying. If you are at primary (2)……………………., you may not go home for lunch and have a cooked meal of meat or (3)…………………………and vegetables. A chicken and lettuce sandwich, with some (4)…………..…..fruit would be a light but (5)……………..….. Many people around the world eat plain, boiled (6)…………………two or three times a day.Pupils and students often don’t eat (7)…………….………when they’re revising for exam – they eat chocolate and (8)……………………..lots of black coffee! And by the way, doctors say everybody should start the day with healthy (9)…………………… It’s also good for you to drink a lot of (10)…………..……….through the day. Ex 7: Make sentences using the words and phrases given. Example : Dr. Minh / diet / expert/ .  Dr. Minh is a diet expert. 1. Getting/ plenty / rest / really / important. …………………………………………………………………………………………………… 2. It / easy / get / flu / . / we / should / try / keep / clean / more/ . …………………………………………………………………………………………………… 3. I/ have / toothache / yesterday / because / I eat / many / sweets / . …………………………………………………………………………………………………… 4. He / has/ flu / . / he / keep / sneezing / coughing / . …………………………………………………………………………………………………… 5. Which / activity / use / more / calories / walking / or / riding / bicycle/ ? …………………………………………………………………………………………………… Ex 8: Can you rewrite the following sentences in correct English? 1. Laughing is not good with health. …………………………………………………………………………………………………… 2. Some people have a very bad habit in littering in public. …………………………………………………………………………………………………… 3. People who live in a dusty area often suffer on diseases. …………………………………………………………………………………………………… 4. In prevent flu, we should keep our hands clean, out feet warm. …………………………………………………………………………………………………… 5. She has a sore throat yesterday. …………………………………………………………………………………………………… Ex 9: Can you correct the mistakes ? I would like living in a place where there is four seasons. In spring there are a lots of beautiful flowers. There are a lot of tall tree in front of my house. There are walk paths around my house but they are all clean. There are a lot of ponds about lakes near my house, so I can do fishing every afternoons. I also would like to play a sport center near my school, so I can doing some sports after class. 1…………………………………………………6………………………………………………… 2…………………………………………………7………………………………………………… 3…………………………………………………8………………………………………………… 4…………………………………………………9………………………………………………… 5…………………………………………………10………………………………………………… Ex 10: Complete the sentences with the correct conjunction (and, or, so, but) 1. Watch less television ________________ you can protect your eyes. 2. He has toothache _______________ he still eats a lot of sweets and cakes. 3. The weather is very cold today _______________ I should put on a coat. 4. Get up early _____________ do more exercise. 5. Take up a new hobby _______________ you’ll have some new friends. 6. I have a lot of homework to do this evening _____________ I don’t have time to watch the football match. 7. If you spend less time on computer games ____________ television programmes, you will have more time for outdoor activities. 8. Eat less junk food ______________ eat more fruit and vegetables. GIAI HỘ MÌNH VỚI Ạ <VOTE 5 SAO>

giúp mk nha k sẽ trả công nha nhanh nhất ẽ đc CTLHN

Để m gam sắt ngoài không khí, sau một thời gian thu được (m + 4,8) gam chất rắn A. Cho toàn bộ chất rắn A tác dụng với dung dịch H2SO4 đặc nóng, dư thấy thoát ra 8,4 lít khí SO2 duy nhất (ở đktc). Tính m?

x^2-2x+1-y^2 (sử dụng máy tính bỏ túi)

Giải giúp mình với ạ. Mình đang cần gấp lắm ạ. Rõ ràng nha

Tìm x x.(3x+2)+(x+1)^2-(2x-5)(2x+5)=-12