2sin^2 x+3sinx=0; 2sin^2 3x+√3sin3x=0; 2sin(π/3-x/2)-√3=0; Sin(π/3-x)+sinx=0; Sin(3x+π/6)+sin(x-π/4)=0 Giúp em với

Nhờ mấy bạn giải giúp mình với ạ Mấy bạn giải rõ ràng ra từng bước cho mik nhé, Cảm ơn trước ạ

$\text{ hướng dẫn tăng ram ảo giúp mik với ạ máy mik 2gb }$

Have you ever entered a tropical rainforest? It’s a special, dark place completely different from anywhere else. A rainforest is a place where the trees grow very tall. Millions of kinds of animals, insects, and plants live in the rainforest. It is hot and humid in a rainforest. It rains a lot in the rainforest, but sometimes you don’t know it’s raining. The trees grow so closely together that rain doesn’t always reach the ground. Rainforests make up only a small part of the Earth’s surface, about six percent. They are found in tropical parts of the world. The largest rainforest in the world is the Amazon in South America. The Amazon covers 1.2 billion acres, or almost five million square kilometers. The second largest rainforest is in Western Africa. There are also rainforests in Central America, Southeast Asia, Northeastern Australia, and the Pacific Islands. Rainforests provide us with many things. In fact, the Amazon Rainforest is called the “lungs of our planet” because it produces twenty percent of the world’s oxygen. One fifth of the world’s fresh water is also found in the Amazon Rainforest. Furthermore, one half of the world’s species of animals, plants, and insects live in the Earth’s rainforests. Eighty percent of the food we eat first grew in the rainforest. For example, pineapples, bananas, tomatoes, corn, potatoes, chocolate, coffee, and sugar all came from rainforests. Twenty-five percent of the drugs we take when we are sick are made of plants that grow only in rainforests. Some of these drugs are even used to fight and cure cancer. With all the good things we get from rainforests, it’s surprising to find that we are destroying our rainforests. In fact, 1.5 acres, or 6,000 square meters, of rainforest disappear every second. The forests are being cut down to make fields for cows, to harvest the plants, and to clear land for farms. Along with losing countless valuable species, the destruction of rainforests creates many problems worldwide. Destruction of rainforests results in more pollution, less rain, and less oxygen for the world. (Adapted from Reading Challenge 2 by Casey Malarcher and Andrea Janzen) Question 44: What is the author’s purpose in the passage? A. To provide factual information about tropical rainforests for readers. B. To prove that rainforests are indispensable in our lives. C. To explain why people have destroyed a large area of tropical rainforests. D. To prevent people from damaging tropical rainforests. Question 45: The word “humid” in the first paragraph is closest in meaning to _____________. A. dry B. moist C. cloudy D. overwhelmed Question 46: Why don’t people know it’s raining in the rainforests? A. Because the trees grow very tall there. B. Because they are the habitats of millions of flora and fauna. C. Because the branches are too dense for the rain to touch the ground. D. Because it hardly rains in the rainforests. Question 47: The following are the facts about rainforests, EXCEPT ___________. A. The only places to see rainforests are in tropical zones. B. The rainforest in Western Africa ranks second after the Amazon in South America in the covered area. C. Rainforests account for about one sixth of the Earth’s surface. D. There’s a considerable variety of plants and animals in the rainforests. Question 48: According to the third passage, which don’t rainforests provide us? A. fresh air and water B. medicine C. seedlings D. clothes Question 49: The word “that” in paragraph 3 refer to ______________. A. plants B. the drugs C. rainforests D. pineapples, bananas, tomatoes, corn, potatoes, chocolate, coffee, and sugar Question 50: What can be inferred from the last passage? A. People are not aware of the significance of the rainforests. B. The consequences of deforestation are greater than what people can imagine. C. The more rainforests are destroyed, the harder people’s life will become. D. People’s economic benefits are more important than environmental problems.

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A = 1+ 1 phần 2+ 1 phần 3+...+1 phần 255<8

Cho biết :M-2x ³y+3x ²y-xy+5=x ³y-x ²y-2 a, Tìm đa thức M.Hãy xác định bậc của đa thức M b, Tính giá trị của đa thức M khi x=1 và y=-1

VII. Read the passage and choose the correct answers. Life is changing rapidly in the large cities of England. However, life in other areas remains much the (1) ……………………… as it has been for centuries. Factories have brought huge population increases to the cities, and city life boomed. City residents have discovered a new (2) ……………………… of life, but in country villages the traditional lifestyle has remained nearly (3) ………………… There have been a few changes, particularly the new steam-powered machinery. It made farm production more (4) …………………… But for the people who remain in the countryside, daily life continues much as it had before the (5) …………… Revolution. Life in country villages continues to (6) ……………… at a slow pace. The daily schedule depends on the times that the sun rose and set and on the weather. In a typical village, the (7) ……………… number of workers is still employed in agriculture or in domestic service. A smaller number of people work in various trades. Even (8) ……………………… work in the professions. Choose the most suitable word to fill in the blank 1. A. similar B. same C. different D. both A & B 2. A. method B. walk C. way D. path 3. A. changeful B. changeable C. unchanged D. change 4. A. efficient B. efficiently C. efficiency D. inefficient 5. A. Industry B. Industrial C. Industrialize D. Industrialized 6. A. run B. walk C. move D. drive 7. A. largest B. biggest C. highest D. all are correct 8. A. more B. less C. few D. fewer

9. If I (not do) ------------------------------ it, nobody would do it

2. It’s time we _________________ the bus. A. catch B. caught C. catching D. to catch Sao ta lại chọn câu B vậy? Could someone please explain it to me?