Tìm điều kiện xác định của các biểu thức sau:

b) D = \(\left(\frac{3}{3x^2+1}+\frac{1}{4}\right):\frac{5x}{3-x}\)

c) C = \(\frac{5x+1}{3x-2}-\frac{x}{4}\)

Bài 15: Giải phương trình sau:

\(\frac{x+2}{2008}+\frac{x+3}{2007}+\frac{x+4}{2006}+\frac{x+2028}{6}=0\)

Bài 17: Giải phương trình sau:

\(\frac{x+1}{65}+\frac{x+3}{63}=\frac{x+5}{61}+\frac{x+7}{59}\)

STRESS

16. A. economic B.encourage C. embroider D. experience

17. A. objection B. opinion C. official D. optional

19. A. Japan B. Australia C. Britain D. Canada

20. A. happen B. local C. expect D. wander

21. A. despite B. dentist C. destroy D. describe

22. A. weather B. lave C. middle D. delicious

23. A. chemical B. upset C. steamer D. cupboard

24. A. jungle B. volcano C. surroud D. marine

25. A. foreman B. microwave C. manufactor D. mortar

26. A. powder B. process C. flavour D. defrost

III. Phonetics.

Sounds

40. A. vanish B. variety C. champion D. miraculous

57. A. pleasure B. heat C. meat D. feed

58. A. chalk B. champagne C. machine D. ship

Stress

1. A. realize B. improve C. possible D. comfortable

2. A. important B. especially C. prefer D. influence

3. A. general B. opinion C. abroad D. surprise

4. A. comfort B. nation C. apply D. moment

5. A. medical B. advise C. vegetables D. physical

6. A. advice B. beauty C. picture D. postcard

7. A. scissors B. object C. wardrobe D. transmit

8. A. Japanese B. understand C. excellent D. Vietnamese

9. A. Moutain B. village C. journey D. between

10. A. restaurant B. motorbike C. enjoyable D. vegetable

11. A. casual B. favorite C. uniform D. amusement

12. A. religion B. official C. separate D. tradition

13. A. damage B. collapse C. border D. funnel

14. A. comprise B. climate C. cotton D. casual

III. Phonetics.

SOUNDS

3. A. danger B. angry C. language D. passage

4. A. character B. children C. teacher D. change

5. A. look B. cook C. book D. roof

8.A. passed B. danced C. lived D. walked

17. A. southern B. sunbathing C. breathe D. thunder

18. A. houses B. faces C. horses D. places

20. A. sure B. sight C. sale D.soil

21. A. exchange B. brochure C. challenge D. charity

26. A. thank B. think C. father D. them

31. A. chair B. cheap C. chorus D. child

33. A. climate B. divided C. write D. religion

38. A. says B. plays C. days D. raise

39. A. feather B. leather C. feature D. measure

40. A. vanish B. variety C. champion D. miraculous

45. A. dosage B. carriage C. voyage D. massage