C1: Giải PT sau: 2/x-1 = 1 + 2x/x+2 C2: Cho a < b, chứng tỏ: 2019 - 2018a > 2018 - 2018b C3: Cho hình thoi ABCD có AB = BD, qua c vẽ đường thẳng d bất kì.. đường thẳng này cắt tia đối của tia BA và DA lần lượt tại E và F. Gọi giao điểm của BF và DE là I a) C/m: tam giác BCE ~ tam giác DFC b) C/m: tam giác BDE ~ tam giác DFB c) Tính S đáy góc EIP=?
C1: Giải pt sau: (có điều kiện) a) |3-2x|= 4x+1 b) |3-5x| = 2x+1 C2: Cho m < n So sánh 2021 - 13m và 2020 - 13n C3: Cho tam giác ABC vuông tại A, đường cao AH phân giác AD, kẻ DK vuông góc AC (K thuộc AC) a) CM tam giác ABC đồng dạng tam giác HAC b) Giả sử AB= 6cm, AC = 8cm. Tính BD C4: 1 ô tô đi từ A -> B với vận tốc trung bình 60km/h lúc trở về vẫn trên quãng đường đó ô tô đi với vận tốc nhỏ hơn vận tốc lúc đi 20km/h nên thời gian lúc về hết nhiều hơn lúc đi 30 phút. Tính độ dài quãng đường AB C5: Cho tam giác ABC vuông tại A biết AB = 15cm, AC = 20cm. Kẻ AH vuông góc BC tại H a) CM: tam giác HBA đồng dạng tam giác ABC b) Vẽ tia phân giác của góc BAH cắt BH tại D c) Trên HC lấy điểm E sao cho HE = HA qua E vẽ đường thẳng vuông góc với BC và cắt AC tại M và qua C vẽ đường thẳng vuông góc với BC cắt theo phân giác của góc MEC tại F. CM: 3 điểm H ,M,F thẳng hàng C6: 1 xe máy khởi hành từ A -> B với vận tốc 35km/h. Sau đó 24 phút trên cùng tuyến đường đó. 1 ô tô xuất phát từ B về A với vận tốc trung bình 45km/h. Biết quãng đường AB dài 142km. Hỏi sau bao lâu kể từ lúc xe máy khởi hành 2 xe gặp nhau?
I. LISTENING Part 1. Listen to the news report and write T or F. 1 A typhoon hit Nghe An Province eartly this morning. ........ 2. Dozens of people were seriously injured in the storm. ....... 3. There was extensive damage to property in Cua Lo, a costal town in Nghe An. ......... Part 2. Listen choose the best answer A, B or C. 1. A powerful storm with serve...........and heavy rain. A. storm B. winds C. thunderstorm 2. Dozes of people were injured in the..........last night A. flood B. drought C. storm 3. Hundreds of other people became....... A. homeles B. homes C. home town 4. A cording to the weather bureau,........will continue over the next few days. A. strong winds B. heavy rain C. big flood II. Find the word wich has different sound in the part underlined. 1. A. twi̲ce B. fli̲ght C. pi̲ece D. mi̲nd 2. A. laughe̲d̲ B. learne̲d̲ C. playe̲d̲ D. arrive̲d̲ III. Find the word with a different stress pattern from the others in each line. 1. A. profession B. pollution C. picture D. eruption 2. A. economic B. volcanic C. artistic D. historical IV. Choose the best option (A, B, C or D) to complete the following sentences. 1. Our city is suffering_________different kinds of pollution: water, air and noise. A. to B. with C. from D. on 2. Several tropical storms______our country recently. A. struck B. have struck C. are striking D. strike 3. The victims on the roofs of the houses______with food and water by the rescue team. A. provided B. will be provide C. were provided D. had provided 4. If we______soon, the pollution will get much worse. A. don't act B. didn't act C. will not act D. hadn't acted 5. I learnt from the news on TV that the earthquake_______hundreds of houses. A. destroys B. were destroyed C. had destroyed D. are destroying 6. Look at your weekly schedule. Your presentation on visual pollution______at 9.45. Don't be late please. A. is starting B. starts C. had started D. has started 7. - Hi, Jane! How nice to meet you here in Manhattan! -"______." A. so am I B. Me, too C. Thank you D. the same to you 8. Eating too much sugar can______to health problems. A. cause B. lead C. make D. do V. Give the correct tense/ form of the verbs in the brackets. 1. You (not lose) ______ weight if you eat too much junk food. 2. New Zealand (divide)______into the North Island and the South Island. VI. Give the correct form of the words in brackets to complete each sentence. 1. the water______is a seriously problem of all countrie in the word. (pollute) 2. Most people had left before the volcano______ (erupt) VII. Read and complete the following passage, using the words in the box. (destructive, problems, their, to, erupts) When a volcano (1)______, hit gases and melted rock from deep within Earth find (2)______way up to the surface. This material may to follow slowly out of a crack in the ground, or it may explode suddenly into the air. Volcanic eruptions may be very (3)______. But they can also create new landforms. Of the nearly 1,900 volcanoes active today, or known to have been active in historical times, about ninety per cent be tound in the areas of South America, North America, Asia, and Oceania that are close (4)______the Pacific Ocean. VIII. Read the passage and answer the questions. There are three main kinds of pollution-air pollution, water pollution, and noise pollution. Air, wich is the most important element of our environment for our survival, can be polluted in many ways. China, the USA, Russia, India, Mexico, and Japan are the world leaders in air pollution emissions. Water is also polluted by the discharge of commercial and industrial waste intro surface water. Sewage in drinking water is another cause of water pollution as it contains germs and viruses. The noise of vehicles, mills, and factories can be really unbearablem This kind of constant sound also causes headaches, tension, mental stress, and migraines. People living next to a building site where there is too much noise can become sick, as they cannot sleep or relax. This is called noise pollution. 1. How many main kinds of pollution are there? _________________ 2. Which is the most important element of our environment for our survial? _________________ 3. Are China, the USA, and Japan the world leaders in air pollution emissions? _________________ 4. Why people living next to a building site where there is too much noise can become sick? _________________ IX. Rewrite the following sentences without changing their original meanings. 1. I'm not you, but I think you should recycle these plastic carrier bags. -> If I were_________________ 2. If he doesn't work hard, he will not pass his exam. -> Unless_________________ 3. The pilots suddenly went on strike, so all filghts had to be cancelled. -> Because_________________ 4. Someone has stolen by bicycle. -> My bicycle_________________