phân tích 8xy^3-x(x-y)^3
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Nếu có 36 bạn thì thời gian hoàn thành sẽ là:
12x24:36=8(ngày)
Bức tranh được hoàn thành sớm hơn dự kiến:
12-8=4(ngày)
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\(12x^3-6x^2y+3x^2y^2\)
\(=3x^2\cdot4x-3x^2\cdot2y+3x^2\cdot y^2\)
\(=3x^2\left(4x-2y+y^2\right)\)
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12 comfortably (adv)
13 comfort (n)
14 amazingly (adv)
15 competed (v)
16 obviously (adv)
17 competitors (n)
18 competition (n)
19 belief (n)
#\(yGLinh\)
#\(yuzuc\text{a}nonsimp\)
11 developed
12 comfortably
13 comfort
14 amazingly
15 competed
16 obviously
17 competitors
18 competition
19 belief
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III.Choose the word whose underlined part is pronounced differently from that of the others.
9. A. honey B. health C. house D. hour
10. A. media B. pressure C. friendly D. stress
11. A. basic B. major C. craft D. racing
12. A. ceremony B. cultural C. cattle D. costume
IV. Choose the best answer A, B, C or D to complete each of the following sentences.
13. Farmers are harvesting their crops in____________________
A. grasslands B. paddy fields C. factories D. highway
14. Julia plays the piano ______________ than Anna does.
A. more goodly B. more well C. better D. gooder
15. I prefer flying kites to _________ computer games.
A. play B. playing C. to play D. played
16. After school, we sometimes post a few questions on the _______ for discussion.
A. bully B. forum C. competition D. notification
17. I love this view because the sky is _________ here in the countryside because there are no buildings .
A. tidy B. close C. dense D. vast
18. Life in the countryside moves ________than life in the city.
A. slowly | B. more slowly | C. slowlier | D. slower |
19. Nancy wants to join the basketball team. _________, she is not tall enough.
A. So B. However C. Because D. Otherwise
20. Does she fancy _________a book to the younger children?
A. reads B. to read C. reading D. read
21. I think country life is so _______ because there are few enterainment places.
A. exciting B. good C. boring D. peaceful
22. The boy has too much schoolwork to do _____he feels stressed.
A. and B. or C. but D. so
V. Choose the best answer A, B, C or D to complete each of the following advertisement/ school announcement/news/menu.
Announcement: Life Experience Talk Show
Hello Everyone!
Come and listen to (23) __________ amazing speakers who will talk about their life experiences. They will (24)______useful advice on how to handle problems, reach your goals, and live a happy life.
Don’t miss out! Join us to learn new ideas and get inspired.
🎟️ Register now at [EventRegistration.com] (25)_____ save your spot!
We can’t wait to see you there!
23: A. a B. the C. an D. some
24: A. give B. giving C. to give D. gave
25: A. for B. to C. in D. on
VI. Read the following passage and choose the correct word or phrase that best fits each of the numbered blanks.
My favorite leisure activity is (26) ________ to music. Firstly, listening (27) ____ music not only help me relax but also provide me with (28)______ knowledge. Secondly, it makes me relax after (29)________ hard-working day. Thirdly, listening to music is a form of entertainment that helps keep my mind comfortable. It also helps me (30)______ my English vocabulary. Finally, All of them is a very important piece of my life. I think they help my soul more plentiful and more love of life.
26 A. listens B. listening C. to listen D. listen
27. A. to B. at C. with D. on
28. A. musical B. music C. musicians D. musician
29. A. an B. the C. ø D. a
30. A. widen B. large C. reduce D. have
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I. Find the word which has a different sound in the underlined part.
1. A. come B. month C. mother D. open
2. A. hope B. homework C. one D. post
3. A. brother B. judo C. going D. rode
4. A. cities B. watches C. dishes D. houses
5. A. grandparents B. brothers C. uncles D. fathers
6. A. books B. walls C. rooms D. pillows
7. A. finger B. leg C. neck D. elbow
8. A. writes B. makes C. takes D. drives
9. A. request B. project C. neck D. exciting
10. A. Thursday B. thanks C. these D. birthday
II. Choose the best answer (A, B, C or D).
1. There are two lights _________________ the ceiling.
A. in B. at C. on D. between
2. There _________________ four chairs and a table _________________ the middle of the room.
A. are – in B. are – at C. is – on D. is – in
3. They are moving _________________ a new apartment _________________ the city centre soon.
A. at – at B. from – in C. to – in D. to – from
4. There are some dirty dishes _________________ the floor.
A. on B. with C. in D. for
5. My bedroom is _________________ the bathroom.
A. under B. in C. on D. next to
6. There aren’t any pillows _________________ the bed.
A. from B. on C. behind D. in front of
7. Can you _________________ me the book, please?
A. move B. pass C. have D. turn
8. Nga is _________________ the phone, chatting _________________ friends.
A. on – to B. on – on C. to – with D. to – to
9. My best friend is kind and _________________. He often makes me laugh.
A. funny B. nice C. shy D. boring
10. The film is very _________________ and we can’t see all of it.
A. Wonderful B. easy C. exciting D. boring
11. The summer camp is for students _________________ between 10 and 15.
A. age B. aged C. aging D. ages
12. Mary has _________________ hair and big _________________ eyes.
A. blonde, small B. a black, blue C. blonde, blue D. black, long
13. Next summer, I am working as a _________________ teacher in a village near Hoa Binh city.
A. volunteer B. nice C. good D. favourite
\(8xy^3-x\cdot\left(x-y\right)^3\)
\(=x\left[8y^3-\left(x-y\right)^3\right]\)
\(=x\cdot\left[\left(2y\right)^3-\left(x-y\right)^3\right]\)
\(=x\left(2y-x+y\right)\left[\left(2y\right)^2+2y\left(x-y\right)+\left(x-y\right)^2\right]\)
\(=x\left(-x+3y\right)\left(4y^2+2xy-2y^2+x^2-2xy+y^2\right)\)
\(=x\left(-x+3y\right)\left(5x^2-y^2\right)\)