Câu 1:Cho hàm số y=(m^2+2m-3)x-1,m là tham số a)Chứng minh rằng khi m thay đổi, đồ thị hàm số luôn đi qua một điểm cố định. b)Xác định các giá trị của m để hàm số luôn đồng biến với mọi x. c)Tìm các giá trị của m để đồ thị hàm số và các đường thẳng y=2x+9 và y=5x+3 đồng quy tại một điểm. Câu 2:Giải hệ phương trình x^2-xy-2y^2=0 x^2-xy-y^2+3x+7y+3=0

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V. Rewrite the following sentences with the word given. 1. What is the matter with him? What is .......................................................? 2. What is his height ? How.............................................................? 3. Children like picture-books very much. Children are interested........................................................................... 4. My mother likes walking better than cycling. My mother prefers.................................................................................. 5. She spends 20 minutes riding a bike to school everyday. It takes ................................................................................................... 6. Let's put waste paper in the garbage bins. Why...................................................... .................................................. 7. You should tip the waiter generously when you eat dinner at this restaurant. You are expected to be................................................................................. 8. There aren't as many trees in my school as there are in yours. Your school has.................................................................................. 9. There isn't as much fresh air in the city as there is in the countryside. In the city there is.................................................................................... 10. They enjoy taveling to Nha Trang on their vacation. They like........................................................................................................

IV. Rewrite in correct order to have meaningful sentences: 1. is / Tam / mine / good / of / friend / a. 2. returned / they / Hanoi / after / to / visiting / Hue. 3. mine / they / rented / apartment / door / to / next / an 4. always / me / she / stamps / she / letters / received / gives / the / from. 5. short / stopped / they / the / at / restaurant / for / time / a . 6. first / she / the / saw / paddies / this / the / is / time 7. learn / use / how / the / she / to / machine / sewing. 8. wrote / letters / often / year / I / my / last / pen pal / to. 9. bought / mother / made / my / and / dress / me / the / a / for / material. 10. taught / some / she / friends/ her / Vietnamese. 11. open / please / you / would / mouth / your? 12. scale / nurse / uses / the / to / me / weigh/ the 13. temperature / takes / my / first / the / nurse 14. a / wait / doctor / to / have / for / I / minutes / few / the 15. week / I / cold / had / last / a / horrible 16. absent / because / was / from / she / class / headache/ had / a / she 17. cold / few / disappear / will / the / last / for / days / a / then /and 18. no / there / for / cure / is / common ./ the / cold. 19. better / stay / at / you / inside / had / recess. 20. filling / Lan / medical / her / is / record. 21. food / they / market / to / the / go / some / buy / to. 22. like / what / for / you / would / dinner? 23. fruit / they / a / at / stopped / stall / buy / to / mangoes / some. 24. is / potatoes / she / frying / now? 25. Lan / slice / mother / cucumbers / her / helped / to / the 26. often / from / dirt / vegetables / have / them / farm / the / on. 27. unhealthy / sugar / not / an / is / food. 28. eat / fruit / should / and / we / vegetables. 29. diet / have / a / we / balanced / should. 30. young / of / play / million / people / games / video. 31. often / arcade / to / he / goes / free / time / his / in / the 32. will / match / between / a / there / school / our / football / and / hers / be 33. people / to / young / prefer / books / video games 34. careful / of / should / be / games / addictive / you 35. or / inventors / young / games / of / as / as / the / the / are / 15 / 14 36. in / life / more / is / city / the /convenient/ in / than / the / country. 37. industry / are / in / more / the / videos / music / very / important 38. get / used / soon / will / to / living / city / they / the / in 39. spend / much / on / video / Don’t / too / time / games/ 40. favorite / his / listening / music / hobby / is / pop / to