Tìm GTNN:D=x ²+2y²+3z²-2xy+2xz-2x-2y-8z+19

Ai giải giùm em môn toán lớp 6 đi ạ

15 phần 34 + 5 phần 21+ 19 phần34 -12 phần 9 + 2 phần 21

IV. Choose the word or phrase which best completes each sentence. Write your answer (A/ B/ C or D) in the numbered box. (4.0 points) 1. My little brother set the table ________ plates, bowls, spoons and glasses. A. by B. in C. into D. with 2. My sister had a baby daughter yesterday and she is my first ________ . A. A. nephew B. niece C. cousin D. relation 3. ________, many teenagers say they don’t like football-one of the world’s most popular games. A. Surprise B. Surprising C. Surprisingly D. Surprised 4. Like Bobby, his wife prefers clothes made ________ silk ________ those of cotton. A. in/ to B. from/ than C. of/ to D. from/ more 5. Always wear goggles as a ________ for your eyes when using the machines. A. protector B. protection C. protect D. to protect 6. Please remove the document________ the glass of the photocopier. A. out B. with C. from D. into 7. Wearing a band over the wrist allows players ________ safely. A. playing B. to play C. play D. plays 8. I hate drinking mineral water. The minerals in the water make it ________ to drink. A. please B. pleasant C. pleasure D. unpleasant 9. I watched a ________ movie last night and I couldn’t sleep. A. scare B. scary C. scaring D. scared 10. ________ tired, I went to bed early last night. A. Felt B. Feeling C. To feel D. Feel 11. She needs ________ how many books there are on the shelf. A. know B. knowing C. to know D. are knowing 12. How many numbers between 10 and 100 are divisible by 5 ________. A. 18 B. 19 C. 20 D. 21 13. Liz liked ________ the dolphin and the color of the cap. A. either B. neither C. both D. none 14. Some people play video games at home. ________ play them in the arcade. A. Other B. The other C. Others D. Another 15. She didn’t play volleyball last week and we ________. A. did, too B. aren’t, either C. don’t, either D. didn’t, either 16. I’m going to a wedding on Sunday. ________ is getting married. A. A friend of me B. A friend of I C. One my friend D. A friend of mine 17. His choice of words ________ good. A. is B. are C. were D. be 18. John: “Hello. Can I speak to Trang, please?” - Trang: “________” A. Speaking. Who’s that? B. What’s the matter with you? C. Hello, John. How are you? D. How do you do? 19. These are my ________ children. A. sister Sara B. sister’s Sara C. sister Sara’s D. Sara’s sister 20. Who is ________of the couple? A. the tallest B. the taller C. taller D. the tall

II. Choose the correct answer to complete the sentences. 6. Don’t drink that water. It’s_______. A. contaminated B. Damaged C. dumped D. cleaned 7. By the time we got to the cinema, the film ______ . A. start B. had started C. starting D. started 8. The team’s success was largely ____ to her efforts. A. since B. due C. because D. lead 9. Eating too much sugar can _______to health problems. A. make B. lead C. cause D. due 10. I often drink coffee, but today I _____tea. A. drank B. am drinking C. drink D. was drinking 11. The old tradition of first-footing is still practiced today in ______ . A. Scots B. Scottish C. Scotland D. Scotlanders 12. The Maori in New Zealand greet each other by _____ their noses. A. punching B. blowing C. touching D. kissing 13. There is a red maple leaf on the ______of Canada. A. banner B. flag C. money D. badge 14. If you ______the president, what would you do to help the environment? A. are B. were C. had been D. will be 15. The heavy rain has caused ______in many parts of the country. A. floods B. drought C. storms D. snow 16. Scientist have come up ____new ways of saving energy. A. for B. along C. to D. with 17. Waste water from many factories which is dumped ______water bodies directly cause water pollution. A. into B. Up C. to D. out 18. Americans throw _____twenty-eight and a half million tons of plastic in landfills every year. A. down B. about C. out D. away

một công việc nếu giao cho người thứ nhất làm thì 10h xong,nếu giao cho người thứ hai làm thì 15h xong,nếu cho người thứ 3 làm thì 30 giờ xong.hỏi nếu cả ba người cùng làm công việc ấy thì họ hoàn thành công việc trong bao lâu

thay giai ho em( -37)+14+26+37=?

Ex4. Read the passage and answer these questions below: England is not a large country. No town in England is very far from the sea, and many English families spend their summer holidays at the seaside. There are no high mountains in England, no very long rivers and very large forests. There are many towns in England. No town is very far from another. The English countryside between the towns is like a carpets of many colors. In Spring and summer, the fields, meadows and forests are light green or dark green, and the gardens are green , red, blue, yellow and white with flowers. Questions 1.Is England a large country? .................................................................................................................................................. 2. Where do many English families spend their summer holidays? .................................................................................................................................................. 3. Are there many towns in England? .................................................................................................................................................. 4. What is the English countryside like? ..................................................................................................................................................

Một xe có khối lượng 2 tấn đang chạy thẳng đều với vận tốc 54km/h thì máng vào xe khác cùng khối lượng đang chạy cùng ngược chiều với vận tốc 18km/h. Sau va chạm, cả 2 dính vào nhau và sẽ chuyển động tới với vận tốc

Cho hai đường tròn (O; R) và (O’;R’) tiếp xúc ngoài tại A. ( R>R’). Vẽ các đường kính AOB, AO’C. Dây DE của đờng tròn (O) vuông góc với BC tại trung điểm K của BC. a) Tứ giác BDCE là hình gì? Vì sao? b) Gọi I là giao điểm của DA và đường tròn (O') . Chứng minh rằng : ba điểm E, I, C thẳng hàng c) Chứng minh rằng : KI là tiếp tuyến của (O')