x^2+x+1 mọi người giúp mình với ạ

Viết đoạn văn (khoảng 20~25 câu) trình bày suy nghĩ về vấn đề: Cho đi cũng là hạnh phúc.

In many countries, like Britain and Japan, wearing school uniforms is still a tradition, but in others, like the United States, France, and Germany, uniforms are not so common. Some people say that uniforms are important. Uniform helps students learn to obey rules and learn to study better. They make all the students equal in appearance. They also help students feel like part of the school. Other people disagree. They say that uniforms are uncomfortable and unattractive. Some of school students make small changes to their uniforms because they want to look more fashionable. They use their uniforms as a way to express themselves. Some students try to attend the school with the best uniform. This is a different way to look at uniforms. An old tradition is turning into a new fashion. 13. In many countries wearing school uniforms is forced. 14. The students only obey the rules when they wear uniforms to go to school. 15. All students are interested in wearing uniforms. 16. There are different opinions about wearing uniforms 17. Why do some people say uniforms are important? – Because . A. they don’t let students express themselves B. they help students study better C. they look nicer than ordinary clothes D. B & C are correct 18. What is the main topic of this passage? A. Schools in different countries. B. Different kinds of uniform C. The best clothes D. The best schools

Task 2: Choose the correct sentence among A, B, C or D which has the same meaning as the given one. 1. Eight years ago we started writing to each other. A. We have rarely written to each other for eight years. B. Eight years is a long time for us to write to each other. C. We wrote to each other eight years ago. D. We have been writing to each other for eight years. 2. The boy was so lazy that he couldn’t stay up late to learn his lessons. A. The boy was lazy enough not to stay up late to learn his lessons. B. The boy was too lazy to stay up late to learn his lessons. C. The boy was lazy enough but he stayed up late to learn his lessons. D. The boy was lazy enough to stay up late to learn his lessons. 3. My father is tired of seeing any violent films. A. My father hasn’t seen a violent film. B. My father has enjoyed all the violent films he has ever seen. C. My father is worried about missing the next violent film. D. My father never wants to see another violent film. 4. As soon as he waved his hand, she turned away. A. He saw her turn away and he waved his hand. B. No sooner had he waved his hand than she turned away. C. She turned away because he waved his hand too early. D. Although she turned away, he waved his hand. 5. John wishes he had remembered to send Mary a Christmas card. A. John regrets not to send Mary a Christmas card. B. John regrets forgetting not to send Mary a Christmas card. C. John regrets not remembering sending Mary a Christmas card. D. John regrets forgetting to send Mary a Christmas card. 6. My father hasn’t smoked cigarettes for a month. A. It’s a month since my father last smoked cigarettes. B. It’s a month ago that my father smoked cigarettes. C. It’s a month that my father hasn’t smoked cigarettes. D. It’s a cigarette that my father smoked a month ago. 7. Having finished their work, the workers expected to be paid. A. The workers expected to be paid because they had finished their work. B. Having their work finished, the workers expected to be paid. C. Having expected to be paid, the workers finished their work. D. Having been finished their work, the workers expected to be paid.

một hỗn hợp A gồm Na2CO3 và Na2SO3 cho tác dụng với dung dịch HCl dư thu được hỗn hợp X có khối lượng mol trung bình là 56g/mol. Cho 0,224 lít (đktc) khí X đi qua 1 lít dung dịch Ba(OH)2 dư. Sau thí nghiệm phải dùng 50ml dung dịch HCl 0,2 M để trung hòa Ba(OH)2 dư. a/ Tính % số mol mỗi khí trong X và % khối lượng mỗi chất trong A b/ Tính nồng độ mol của dung dịch Ba(OH)2 ban đầu

nhờ mọi người giải hộ : Một vật giao động điều hòa đi từ vị trí có li độ x=-5 đến x=+5 hết 0.25s sau đó đi thêm 0.25 s thì quay lại vị trí M vừa đủ một chu kì. Tìm biên độ dao động ?

1. Before the appearance of newspapers, people got news from the ________. A. computer B. examinee C. magazines D. town criers 2. Make sure you ________ us a visit when you are in town again. A. do B. give C. pay D. have 3. Have you read the article ________ Time magazine ________ Google? A. on / by B. in / on C. on / in D. at / on 4. The ao dai consits of a long silk tunic that is slit ________ the sides. A. from B. to C. for D. on 5. People should use more solar energy ________ it is cheap, clean and unlimited. A. because B. or C. so D. and 6. My leg is hurt; ________, I can’t walk upstairs. A. However B. Therefore C. Because D. So 7. We’d better get an electrician ________ the system before we start decorating. A. check B. checking C. to check D. checked 8. My parents would not let me ________ up late when I was a child. A. to stay B. staying C. stay D. stayed 9. Alice: “What a nice day it is!” Betty: “___________” A. I love beautiful weather. B. It’s Sunday today. C. It’s on Sunday. D. Yes, why don’t we go on for a picnic? 10. Ben: “Where shall we meet?” Peter: “___________” A. Let’s go by taxi B. Let’s start early C. Why not here? D. Why not?

Task 1: Give the correct form of verb using present perfect tense. 6. You ever (write) _______________ a love letter for Valentine’ Day? 7. You ever (meet) _______________ a famous person. 8. We already (see) _______________ the film at home. 9. Karen (send) _______________ me an email. 10. My boyfriend (give) _______________ up smoking for 2 months.

Giải giúp mình với mọi người ơi

Giải thích rõ giúp em với. Bài này khó