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cho tứ giác ABCD, có hai đường chéo AC và BD vuông góc với nhau và cắt nhau tại O. Từ O kẻ OK vuông góc với DC; OK kéo dài cắt AB ở I. Chứng minh rằng nếu: góc BAC = góc BDC thì IA = IB và ngược lại.
Cho tam giác ABC cân A, kẻ AD vuông góc BC. Chứng minh tia phân giác của góc A
Qua điểm A nằm bên ngoài đường tròn (O), kẻ hai tiếp tuyến ABC, AMN. Hai đường thẳng BN và CM cắt nhau ở S. CM: a) A + bsm = 2CBN b) AM + AN = AB. AC
I. Fill in each gap in the sentences with a suitable adjective from the box : difficult, welcome, shocked, impossible, willing, careful, lucky, motivated, anxious, content 1. Are you __________________ to accept responsibility ? 2. She was __________________ to hear her children falling from the tree. 3. You’re _________________ to use my car. 4. You’re very ___________________ to be alive after that accident. 5. It’s virtually __________________ to predict the weather accurately. 6. It’s ___________________ to climb that high and steep hill. 7. Be __________________ not to walk on the sidewalks ! 8. These students are _________________ to learn English. 9. The children are ________________ to go to the circus. 10. He was ________________ to stay at home and read a book. II. Fill in each gap with the correct passive form of the verb from the box : A. FORM : answer, make, send, open, use, build, hold, sign, clean, recycle 1. This room will ________________ later. 2. This parcel mustn’t _____________________ until Christmas. 3. Tea can ___________________ with hot water. 4. Tires can _____________________ to make pipes or floor coverings. 5. Applications should ___________________ before December 30th. 6. A meeting will ___________________ before Teacher’s Day. 7. The new bridge is going to __________________ by the end of the year. 8. Cloth bags should ________________ instead of plastic bags. 9. This question can _________________ by most of the students. 10. This contract must __________________ by the manager today. III. TENSE : publish, build, pollute, injure, make, paint, plant, play, cut 1. Football _____________________ all over the world. 2. Millions of cars _____________________ in Japan every year. 3. How many languages _____________________ in Canada ? 4. Lots of trees _____________________ down last year. 5. The ceiling _____________________ on. 6. His best work _____________________ next year. 7. She ___________ seriously _______________ last night. 8. Two more bridges _____________________ in this area next month. 9. Our environment _____________________ by chemicals at present. 10. Young trees _____________________ in the school garden by seventh form students last week.
Cho tam giác ABC vuông tại A , AB=3cm , AC=4cm , và tam giác MNP vuông tại M , MN=15cm , NP=25cm (vẽ hình) a)Tính độ dài các đoạn thẳng BC , MP b)Tam giác ABC có đồng dạng với tam giác MNP không ? Tại sao ? c)Tính tỉ số diện tích hai tam giác ABC và MNP , so sánh tỉ số này với tỉ số đồng dạng của hai tam giác
ài 2: Một xe tải khối lượng 2 tấn, bắt đầu chuyển động nhanh dần đều sau khi đi được quãng đường 144m thì vận tốc đạt được 12m/s. Hệ số ma sát giữa xe và mặt đường là μ = 0,05. Tính công của các lực tác dụng lên xe trên quãng đường 144m đầu tiên. Lấy g = 10m/s2.
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REARRANGEMENT A. TRANSFORMATION 1. The Browns go to work by bus. They want to save natural resources. ® In order to 2. I took off my shoes. I didn’t want to make any noise. ® I took off my shoes so as 3. The police came here because they wanted to investigate the causes of the accident. ® The police came here so as 4. Because my children don’t want to be late for school, they get up early. (in order not to) ® My children _____________________________________________________ 5. She wants you to help her clean the windows. ® Can you 6. I learn English so that I can communicate with foreigners. ® I learn English so as ______________________________________________ 7. I want you to give me a bandage. ® Could _________________________________________________________? 8. Do you want me to drive? ® Shall I? 9. I want you to help me carry my bag? ® Can you? 10. Turn down the TV, please. ® Will you _______________________________________________________? 11. Keeping the environment clean is very important. ® It's 12. They will show the time machine to the public when they finish. ® The time machine 13. He was delighted to receive his aunt’s letter. ® He was 14. Old car tires are recycled to make shoes and sandals. ® People 15. I'm very sad that I wasn't accepted in that group ® I'm very sad 16. We can use the garbage to make fertilizer. ® The garbage 17. We should reuse plastic bags. ® Plastic bags 18. People speak English all over the world. ® English 19. We should use cloth bags instead of plastic bags. ® Cloth bags 20. Bell invented the telephone in 1876. ® The telephone B. REARRANGEMENT 1. her bike/ fell off/she/on the road/and hit her head. ® She 2. be there/ will/ the ambulance/ about 10 minutes/in. ® The ambulance 3. blankets or coats/overheat/don’t/the victim/with ® Don’t 4. the burns immediately / tissue damage/ cool/ minimize/so as to. ® Cool 5. ease the pain/should/you/ ice or cold water packs/ with. ® You 6. first-aid/people/ease the victim’s pain/use/in order to. ® People 7. vegetable matter/into/we make/and fertilise our fields/compost. ® We make 8. compost /farmers/ collect household/garden waste /and/to make . ® Farmers 9. can be/ milk bottles/being cleaned/after/recycled. ® Milk bottles 10. in June/ we are/seeing you/looking forward /to. ® We are 11. environmentally friendly products/in order to/our beautiful environment/try to use/protect. ® Try to use 12. are thrown away/every single year/old car tires /of/Millions. ® Millions
ông Hai trong truyện ngắn làng của kim lân được xây dựng cới 1 tính cách khác đặcbiệt - ông hay khoe về làng ngay cả khi làng bị đốt. EM hiểu được điều gì về con người ông 2
Tính diện tích hình thang vuông, biét hai đáy có độ dài là 2cm và 4cm, góc tạo bởi một cạnh bên và đáy lớn có số đó bằng 45°
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