Đáp án:
`x=16`.
Giải thích các bước giải:
`1/(1xx2)+1/(2xx3)+1/(3xx4)+...+1/((x-1)xx x)=15/16`
`->1-1/2+1/2-1/3+1/3-1/4+...+1/(x-1)-1/x=15/16`
`->1-1/x=15/16`
`->1/x=1-15/16`
`->1/x=1/16`
`->x=16`
Vậy `x=16`.
`1/(1×2) + 1/(2×3) + 1/(3×4) + ... + 1/((x - 1) × x) = 15/16`
`1/1 - 1/2 + 1/2 - 1/3 + 1/ 3 - 1/4 + 1/(x - 1) - 1/x = 15/16`
`1/1 - 1/x = 15/16`
`1/x = 1/1 - 15/16`
`1/x = 1/16`
`⇒ x = 16`
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27. There was..... accident as I was going ..... home last night. Two people were taken to....... hospital. I think ...... most accidents are caused by ........people driving too fast. A. the/a/ the/ x/x B. x/x/ an/the/ the C. an/x/the/x/x D. an/x/x/ x/x 28. ....... atmosphere at ........ party was likely and free. A. the/a B. a/the C. the/ the D. x/x 29. After......... World War II, .........United Nations was formed. A. the/a B. a/the C. the/ the D. x/the 30. People eat chocolate all over ...... world. It is probably ......... most popular candy in ........ world. A. the/a/ the B. the/the/ the C. x/the/ the D. x/x/ the 31. Do you live in ..........big city or in ........... small town? A. the/a B. a/a C. the /the D. x/x 32. A: Do you know Lan's sister? _ B: Yes. In fact, she is .............friend of mine. A. the B. a C. an D. x 33. Are you taking ..........French this semester? A. the B. a C. an D. x 34. Have you ever been to ..............countryside? A. the B. a C. an D. x 35. ….Germany is ……. Important economic power. A. the/a B. a/a C. the /the D. x / an
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Write about your schedule this summer in 3-5 sentences. Answer these questions: - Where are you going? - When are you going? - Who are you going with? - What are you going to do? Giúp mik với ạ!
Ex1: Choose the best answer. 1. My younger brother is _______________. A. more and more intelligent B. much and much intelligent C. most and most intelligent D. intelligent and intelligent 2. Her brother is becoming _______________. A. more and more tall B. taller and taller C. tall and tall D. much and much tall 3. Women’s employment rate is getting ____________. A. high and high B. higher and the highest C. high and higher D. higher and higher 4. Bill is ____________. A. lazier and lazier B. more and more lazy C. lazier and more lazy D. more lazy and lazier 5. The test becomes _______ and_________. A. hard/ hard B. difficult/ difficult C. harder/ harder D. difficulty/ difficult 6. His health is getting __________and__________. A. good/ good B. better/ better C. bad/ bad D. well/ well 7. The larger the city is, ___________ the crime rate is. A. highest B. higher C. the highest D. the higher 8._______ you study for these exams, _______ you will do. A. The harder / the better B. The more / the much C. The hardest / the best D. The more hard / the more goodDuong Xa secondary school N.T.T.N 9. The more paper we save, ___________ preserved. A. more is wood pulp B. the more wood pulp is C. wood pulp is D. the much wood pulp is 10._______ I study for these exams, _______ I will do. A. The harder/ the better B. The more/ the much C. The hardest/ the best D. The more hard/ the more good 11. _____________ the test is, ___________ her score is. A. harder/ lower B. The harder/ the lower C. hard/ low D. The more hard/ the more low 12. _____________ my father is, ___________ I feel. A. angrier/ worse B. The more angrier/ the more worse C. angry/ bad D. The angrier/ the worse 13. _____________ she thinks of, ____________ she makes. A. idea/ post B. ideas/ posts C. The more ideas/ the more posts D. The ideas/ the posts 14. ____________ babies cry, _______________ my aunt feeds them. A. The harder/ the more quickly B. hard/ quickly C. The more harder/ the more quickly D. harder/ quicklier 15. Many students think that ______ they graduate from university, ____ chance they have to find a good job. A. The sooner/ the better B. soon/ good C. The soon/ the good D. The more soon/ the more good 16. _____________ the test is, _______________ it is to succeed. A. The more difficult/ the sweeter B. difficult/ sweet C. more difficult/ sweeter D. The more difficult/ the more sweeter 17. __________ she studies for these tests, __________ she will do. A. The harder/ the better B. The hardest/ the best C. The more/ the much D. The more hard/ the more good 18. _________ James is, _________ he falls. A. The bigger/ the hardest B. The hardest/ the biggest C. The bigger/ the harder D. The more big/ the more hard 19. _________ my sister studies, _________ she will become. A. The many/ the smarter B. The more/ the smarter C. The more/ the smartest D. The more many/ the more smart 20. ________ milk tea my elder sister dinks, ________ she becomes. A. The more/ fatter B. More/ the fatter C. The more/ the more fat D. The more/ the fatter 21. __________ this exam is, _______ Linda likes. A. The more difficult/ the more B. The difficult/ the more C. The more difficult/ the many D. The more difficult/ the many 22. _________ Mary learns, __________ she knows. A. The more/ the most B. The many/ the more C. The many/ the many D. The more/ the more 23. __________ Tom tries, _________ he succeeds. A. The more/ the most B. The many/ the more C. The many/ the many D. The more/ the more 24. ________ I love her, _______ I hate myself. A. The more/ the most B. The more/ the more C. The many/ the many D. The many/ the more
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