user-avatar
nguyenthinhan30091986
2 năm trước
Cho `b\sqrt3>a>0`. CMR: `((a+b)/2)^3\ge a^2\sqrt((3b^2-a^2)/2)`
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

SECTION I: PHONETICS (1pt) 1. A. lamp B. table C. family D. plan 2. A. skip B. swim C. fried D. milk 3. A. hungry B. sky C. healthy D. thirsty 4. A. books B erasers C. rulers D. bags SECTION II: VOCABULARY, GRAMMAR AND STRUCTURES Part 1: Choose the best answer (2,5pts) 1. How............... kilos of beef does she want? A. many B. much C. often D. about 2. His father is waiting................ a bus. A. to B. for C. of D. at 3. We go there by car and they go......... foot. A. on B. by C. to D. with 4. Listen! Who......... to your sister? A. is going to talk B. talks C. does talk D. is talking 5. Fall means......... in British English. A. summer B. winter C. spring D. autumn 6. Tokyo is.............. than Mexico City. A. smaller B. smallest C. the smallest D. small 7. I don't have......... apples but I have...............oranges. A. any/ some B. any/ any C. some/ any D. some/ some 8. What color................her eyes? A. is B. are C. do D. does 9...................... is a pen?. It is 5,000 dong. A. How many B. How C. How often D. How much 10. She isn't strong. She is............... A. weak B. tall C. short D. heavy Part 2: Supply the correct form of verbs: (1,5pts) 1. I (write).........to my parents now, I (write)....... to them every weekend. 2. You (go).................to the party tonight? 3. Mary (listen)................to music at the moment. 4. He (want)................(be).............a doctor. SECTION III: SPEAKING Match the question in column A with the right answer in column B. (1pt) A B 1. What weather does she like? 2. How often do you go shopping? 3. How do you go to school? 4. Why don’t we go to the beach? a. I walk to school. b. Good idea. c. Once a week. d. She likes warm weather. 1…………… 2………………….. 3………………… 4………………… SECTION IV: READING (2pts) Read the text and decide if these statements are True (T) or False (F) My uncle is an engineer. His name is Hung. He is going on vacation this summer. First, he is going to visit Ha Long Bay. He is going to stay in a small hotel near the bay for two days. Then he is going to visit Da Lat for three days. Finally, he is going to visit some friends in Ho Chi Minh City. He is going to stay there for one day. He is going to walk along Saigon River. He is going to fly home. True(T)/ False(F) statements: 1....... Mr. Hung is going to visit three cities this summer. 2.......He is going to visit Ha Long Bay first, then Ho Chi Minh City, and finally Da Lat. 3.......He is going to stay in Da Lat for three days. 4........He is going to go home by train. SECTION V: WRITING (2pts) Arrange the words into the sentence: 1. want/ Tom/ Mary/ and/ glasses/ two/ of/ water. ..................................................................................................................................... 2. sister/ my/ going/ is/ to/ live/ country/ the/ in. ..................................................................................................................................... 3. the/ spring/ in/what ................... SECTION V: WRITING (2pts) Arrange the words into the sentence: 1. want/ Tom/ Mary/ and/ glasses/ two/ of/ water. ..................................................................................................................................... 2. sister/ my/ going/ is/ to/ live/ country/ the/ in. ..................................................................................................................................... 3. the/ spring/ in/ what/ weather/ is/ like/ the? .................................................................................................................................... 4. building/ tallest/ the/ is/ this/ the/ in/ world. .............................................................

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team