Tìm m để các biểu thức sau luôn có giá trị dương với mọi số thực x f(x) =x^2-4x+m+3

Các câu hỏi liên quan

I. Circle the letter a, b, or c before the best answer: 1. Let’s _________ to the English club. a. to go         b. go           c. going d. goes 2. There is _________ milk in his glass. a. little           b. few           c. many d. much 3. How often are you late for school? a. I am never late for school.         b. I never am late for school. c. I am late never for school. 4. English books are _________ the back _________ the library. a. on/ of          b. of/ at          c. at/ of d.in/ in 5. Tam is _________ at Math. a. well           b. nice         c. good d. beautiful 6. We _________ Christmas on December 24th. a. make          b. celebrate         c. get d. buy 4 7. We enjoy _________ part in after-school activities. a. take          b. to take          c. taking d. takes 8. A mechanic _________ machines in a factory. a. buys           b. repairs         c. works d. eat 9. Mary is _________ intelligent than Alice. a. more           b. much          c. many d. few 10. _________ a lovely room! a. When          b. How            c. What d. Where II. Give the correct tenses or forms of verbs in brackets: 1. What ……………your father usually (do) _________ in the evenings? - He usually (watch) _________ TV. 2. He (be) _________ out at the moment but he (be) _________ back at about seven o’clock. 3. I can (see) _________ the children. They (play) _________ in the yard. 4. Would you like (listen) _________ to music? - No, thanks. I like (read) _________ books. 5. You ( watch ) .......................T.V. ? Can I turn it off ? 6. Every morning , my mother ( walk ) _________ in the park . 7. What newspaper _________you usually (read ) _________?The Times. 8. Be careful ! The teacher ( look ) _________ at you . 9. Your brother ( do) _________morning exercise every day ? 10. In summer , it ( be ) _________ very hot , so he often ( go ) _________ to the seaside on holiday. III. Make questions for the underlined words or phrases: Ex: My father is a worker? → What does your father do? 1. He goes to the library three times a week. 2. Viet’s father works in a factory. 3. Mr. Jones gives Minh a lot of stamps. 4. They will meet their friends on Wednesday. IV. Rewrite the following sentences using the words or phrases given: 1.The green dress is cheaper than the black dress. The black dress__________________ 2. Let’s come to my house after school. What about____________? 3. Mr. Tam drinks more coffee than Mr. Lam. Mr. Lam__________________ 4. When is your birthday? What’s________________? V. Fill in each gap with one suitable word At school, we have many subjects. In Physics, we ______________some experiments. In ____________we learn about books and essays. In History, we study past and present___________ in Viet Nam and around the world. In Geography, we learn about different _____________and their people. And, we also enjoy drawing in the Art class. We like all of our classes.