Mọi người ơi giúp em bài này với gấp ạ

câu 1 : phương trình 2 cos ²x-5cosx+2=0 tương đương với pt A. cosx=1/2 B. (cosx-1) (cosx-1/20) =0 C. (cosx-1) (cosx+1)=0 D.(cosx+1) (cosx-1/20) =0 câu 2 : phương trình sinx+1/cosx-2 =m có nghiệm khi A. -4/3 <hoặc= m <hoặc= 0 B. m <hoặc=0 hoặc m>hoặc=4/3 C. m<hoặc= -4/3 hoặc m>hoặc=0 D. 0<hoặc= m <hoặc= 4/3 câu 3: cho pt msinx+cosx=1 phát biểu nào sau đây đúng A.pt chỉ có nghiệm khi m thuộc [-1:1] B. pt đã cho luôn có nghiệm với mọi m C. pt đã cho luôn vô nghiejm với mọi m D. pt chỉ có nghiệm khi m=0 câu 4: pt sin(2x+2pi/3)+sin(2x+pi/3)= - √3/2 có bao nhiêu nghiệm thuộc đoạn [0;6pi] A.6 B.9 C.12 D.15

I. Choose the underlined word or phrase (marked A, B, C or D) in each sentence that needs correcting. 1. My sister is very seriously and hard-working in her study. A B C D 2. Ride a bike at the weekend is my best friend's hobby. 3. She is very cared, so she always helps her mother do the housework. 4. My friend has a short brown hair and an oval face. 5. Because Nga is very keen on the school's singing competition, she is taking part on it tomorrow. 6. I have an important maths exam tomorrow afternoon, so I do a lot of maths exercises at home this evening. 7. We have a lot of assignments to do. Therefore, we are going to the cinema with you tonight. 8. I have new pencil, a pencil sharpener and a pencil case. 9. The painting competition will start at his school on the 17th of October. 10. She usually plays the piano every Monday evening, but today she watch cartoons with her younger sister. 11. There are a table, four chairs, two pictures and a vase in the living room. 12. There aren't a lot of posters in the wall in his bedroom. 13. My dog has a long tail, big eyes and a yellow fur. 14. She has a birthday party with a big birthday cake and a lot of candles at home at present. 15. She is short hair and big eyes 16. My new friend, Zoe, is very friend and helpful 17. Tomorrow, John and I is playing basketball with our team 18. This student are very smart, studious and well-behaved 19. My mother have an oval face and lovely smile 20. Would you like going to the movies tonight?

Vẽ tranh chống Covid-19 đơn giản hay phức tạp đều được nhé

giúp e với mng :)) làm 3 câu này là đc

cho 1 ví dụ về quá khứ đơn và 1 ví dụ về hiện tại hoàn thành

Mìn hc dở a quá mấy bn giúp mìn với, mìn cho hn nhé

Viết lại câu 31. “Don’t forget to phone the office,” she told him. => She reminded………………. 32. I’m afraid I haven’t got time to listen to you. => I wish……………………. 33. The police has just released John. => John……………………………………………………………………………………………. 34. I couldn’t hear them because they were speaking too softly. => They were speaking……… 35. We spent 5 hours getting to London. => It took…….. 36. I get to work in 20 minutes. => It ……………… 37. It is necessary that this work be finished by Monday. => This work…….. 38. It’s a pity I didn’t take my doctor’s advice. => I wish…………… 39. The bread is so stale that we can’t eat it. => The bread isn’t………. 40. Who does this bag belong to? => Whose……..

giải pt x^2 +1 =2 √2x-1 giúp với ạ

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