cho ΔABC vuông tại A và có BD là đường phân giác của góc B , kẻ DE ⊥ BC . Gọi F là giao điểm của AB và DE . chứng minh rằng : a) BD là trung trực của AE b) AD < DC c) AE // FC

Choose the most appropriate word or phrase to fill in each blank (2.5pts) 1. I was late for school this morning because my alarm clock didn’t _________. A. get off B. ring off C. put off D. go off 2. You should clear ________ all the trash on the ground before leaving A. over B. up C. off D. out 3. “How about going to the cinema tonight?” – “_________.” A. Never mind B. No, I don’t mind C. Yes, let’s D. No, thanks 4. A(n)________ is someone who works to protect the environment from damage or destruction. A. conservationist B. electrician C. consumer D. plumber 5. _________ many households use energy-saving bulbs, their electricity bill is still enormous. A. Since B. When C. If D. Although 6. Ultimately, we will have to make the decision ourselves. A. Finally B. Basically C. Generally D. Consequently 7. The ground was full of _________ after the hot, dry summer. A. garbage B. pollutants C. faucets D. cracks 8. The children like ________ on nice clothes when going out. A. having B. putting C. getting D. wearing 9. What does this sign mean? A. No overtaking B. No crossing C. No moving D. Slippery road ahead 10. The sign says: A. You must put the garbage into the dust bin. B. You can leave trash around C. People will collect your trash D. Don’t worry. Please litter as you like. Rearrange the words and phrases given in the correct order (0.5pt) 15. the local authorities / to the countryside / I / moving factories/ suggest / should stop //-- > I ___ 16. Lots of / solar energy / in the world / have already used / countries // --- > Lots _______ Choose the word or phrase that best fits the blank space in the following passage (1pts) Air pollution is by far the most harmful form of pollution in our environment. Air pollution is (17) ________________ by the injurious smoke emitted by cars, buses, trucks, trains, and factories. Even smoke from burning leaves and cigarettes are (18) ______________ to the environment causing a lot of damage to man and the atmosphere. Evidence of increasing air pollution is seen in lung cancer. Water (19) _________________ caused by industrial waste products released into lakes, rivers, and other water bodies, has made marine life no longer hospitable. Humans pollute water with large scale disposal of garbage and other household waste. In many rural areas, one can still find people bathing and cooking in the same water, making it (20) _________________ filthy. 17. A. installed B. caused C. checked D. spoiled 18. A. harmful B. luxurious C. efficient D. enormous 19. A. consumption B. preservation C. conservation D. pollution 20. A. necessarily B. providedly C. incredibly D. ultimately Read the passage then decide whether the statements are True or False and choose the best answer Solar energy has been used for generating electricity since 1954. Solar panels are installed on the roofs of houses to turn the energy of the sun into the electricity that people can use for heating, cooking, lighting and many other purposes. In order to get solar energy what we need are solar panels and the sun. One of the advantages of solar energy is that solar panels are totally silent and non- polluting. However, solar energy also has some disadvantages. We can only generate solar energy during daytime because the system depends on sunlight. The main disadvantage of solar energy is that solar panels are expensive. Scientists are doing their best to reduce the cost of solar panels so that more and more people can use this environmentally friendly source of energy. 21. Solar energy brings harmful things to everyone. 22. There are not any disadvantages in generating electricity from the sun. 23. People install solar panels on the roofs of houses to get energy of the sun. 24. Solar panels are expensive, so scientists try their best to reduce their cost. 25. What is the best tittle of the passage? A. Solar panels B. Solar energy, an environmentally friendly source of energy C. The advantages of solar energy D. The disadvantages of solar energy 26. The word “expensive” in the text means : A. standard B. energetic C. costly D. enormous

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Tính nhanh: 998.997+997+997 Giúp mình với ạ, mik cảm ơn

tìm tham số m để : 16x^4 + 5(m^2 +1)x + 4(m+7) > 0

Mọi người ơi giải giúp mk hệ nek vs akk 😢

1 người đi xe máy từ A đến B trong nửa quãng đường đầu người đó đi với vận tốc trung bình 30km/h trên quãng đường còn trên trong nửa thời gian đầu người đó đi với vận tốc trung bình 20km/h và sau đó đi với vận tốc trung bình 24km/h . Biết thời gian đi từ A đến B là 3h. tính quãng đường AB

1. It is 10 kilometers from here to ACB bank. …………………………………………………………………………………… 2. I have known Marie for nine years. ................................................................................................................................ 3. They have studied there forten years. ................................................................................................................................ 4. Sarah left two hours ago. ................................................................................................................................ 5. She is watching Tom and Jerry. ................................................................................................................................ 6. It is an action film. ................................................................................................................................ 7. She likes watching comedy. ................................................................................................................................ 8. It starts Lee Min Hoo and Jun Ji Huyn. ................................................................................................................................ 9. I felt terrified before my last Maths test. ................................................................................................................................ 10. She felt entertained when she watched a gripping film. ................................................................................................................................

Giải giúp e câu 27 thui ạ mn ơi