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huongthily
2 năm trước
Xác định m để phương trình sau vô nghiệm m^2x^2 + 2mx +5 = 0 chỉ cần tìm denta phẩy của phương trình trên cảm ơn mong các bạn giúp và chỉ cần tìm denta phẩy ko cần giải
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I. Choose the word which is pronounced differently from the others. (1m) 1. A. clothes B. watches C. benches D. classes 2. A. read B. teacher C. eat D. ahead 3. A. pens B. books C. rulers D. erasers 4. A. kite B. twice C. swim D. pastimes II. Choose the best answer: (3ms) 1. I'd like................. bananas, please! a. any b. some c. many d. much 2. Lemonade, apple juice and................. are cold drinks. a. vegetables b. noodles c. iced tea d. beans 3. She isn't heavy. She is.................. a. thin b. fat c. strong d. light 4. Lan................. aerobic everyday. a. does b. plays c. goes d. dances 5.................. sports do you play? a. What's b. Who c. Which d. How 6. We need a tent to go................. a. fishing b. swimming c. camping d. jogging 7. They are going to stay................. their uncle and aunt this summer vacation. a. in b. at c. by d. with 8. What is your nationality? I am................. a. Vietnamese b. Vietnam c. England 9. There are only two................. in my country. a. weather b. seasons c. citadel d. cities 10.................. do you go to school? Every afternoon. a. How much b. How often c. How many d. How 11. What do you often do................. it is hot? a. What b. Which c. How d. When 12. What about.................. tennis this afternoon? a. play b. playing c. to play d. plays

4. Choose the best answer a, b, c or d to complete the sentence. 1. _________ September 1, 2019, Hurricane Dorian hit the northwestern Bahamas. A. In B. On C. At D. During 2. The earthquake caused damage_________ property estimated at $6 million. A. for B. with C. on D. to 3. Due to a lack of rainfall, California regularly has_________ in summertime. A. tornadoes B. floods C. droughts D. tsunamis 4. What a(n) _________ news! Thousands of people have died in the quake. A. terrible B. wonderful C. terrific D. exciting 5. Debris was_________ for miles after the tornado touched down late Saturday. A. evacuated B. scattered C. collapsed D. trapped 6. Natural disasters are caused by nature and_________ we can’t prevent them. A. therefore B. however C. moreover D. whereas 7. At least 11 people were killed when a four-storey building_________ in the earhquake. A. was collapsing B. had collapsed C. collapsed D. was collapsed 8. _________ the tsunami warning, there were still lots of people on or near the beach. A. Due to B. Although C. Because D. Despite 9. It is raining heavily with rolls of thunder. We_________ such a terrible thunderstorm. A. never see B. would never see C. had never seen D. have never seen 10. “A12 year old boy was found alive after being buried in an avalanche for 40 minutes.” - “_________” A. That’s awesome! B. That’s shocking! C. That’s awful! D. Well done

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