Trong C , căn bậc hai của -121 là:
A. -11i.
B. 11i.
C. -11.
D.11i và -11i.
K
Khách
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B
10 tháng 2 2023
ĐỀ 11 I Pronunciation A. Circle the word underlined part is pronounced differently from that of . (1.0 point) 1. A. mention B. option C. federation D. question 2. A. ghost B. office C. long D. modern 3. A. waited B. mended C. objected D. faced B Find the word A, B, C, or D which has different stress pattern in line 1. A.energy B.plentiful C. disappear D.celebrate 2.?? II. Circle the best answer to complete each of the following questions. (3.0 points) 1.The book ______ consists of four parts has been translated into Vietnamese. A. which B. what C. who D. whose 2. My friend is fond of _______ to music in the evening. A. listen B. listening C. to listen D. listened 3. My sister loves watching the stars………….. night. A. on B. in C. at D. for 4. He was born ______ September 10th, 1996. A. in B. on C. at D. from 5. Traveling by air is not cheap and it isn’t interesting ______. A. either B. neither C. too D. also 6. “I suggest going to the beach on the weekends.” “____________”. A. That’s a fine day! B. That’s a good idea! C. That’s a good trip! D. That’s a reason! 7. If I were you, I _______ to buy that car. A. would forget B. will forget C. forget D. forgot 8. Lan studied hard, ______ she completed her exam successfully. A. although B. so C. because D. since 9. “I can’t find my wallet, Tom” – “Don’t worry. I’ll help you to ______ it” A. look for B. take care of C. put on D. turn off 10. _______ he wasn’t invited, he went to the party. A. Although B. Because C. So D. As 11. His house looks very large and beautiful. It is _________house. A. a seven-room B. a seven-rooms C. seven room D. seven rooms 12. "What would you like to drink?" - "_________". A. Yes, please B. Milk, please C. No, thanks D. OK 13. Lan is very tired. _________, she has to finish her assignment before going to bed. A. Although B. So C. Therefore D. However 14. Your sister works in a foreign company, …………..she? A. isn’t B. didn’t C. wasn’t D. doesn’t 15. It's very hot today. I wish I_________on the beach now. A. am B. was C. were D. have been III. Complete each sentence with appropriate forms of the verb in brackets (2.0 points) 1. Hung (1.know)…knows……. a little English, so he (2.wish) …wishes…....he (3.can speak) …could speak……it fluently. 2.When I entered his room, I ( 4.see ) …saw………… him (5.sleep)……sleeping……….. in a chair 3.My sister is on her summer holiday. She ( 6. lie ) ………is lying………on the beach at the moment . 4.If I ( 7. be ) ………were…..you , I would buy that house 5. I enjoy (8. teach)……teaching…….., and I (9. teach)……………have been teaching………. for ten years. 6. I suggest ( 10. put ) ………putting……….garbage bins around the schoolyard. |
IV. Read the passage and circle the best answer to each of the following questions about it. (1.0 point)
Last year, we had a nice holiday. My friend and I went to the seaside for a month. I had been to the seaside several times before, but this was the first time for my friend. Naturally, it was a great event for him. Finally, the day came. It was a fine morning. We got up very early because we wanted to leave home after breakfast. We made the journey by car. We reached the seaside at noon. We spent many hours on the beach. We enjoyed making castles and channels in the sand. People said we ought to spend at least a few weeks at the seaside. It we could stay longer, so much the better.
1. How long did the writer and his friend spend at the seaside?
A. A week B. A few weeks C. A month D. A few months
2. Who went to the seaside the first time?
A. The writer B. The writer and his friend
C. The writer’s family D. The writer’s friend
3. What was the weather like on the day they started their journey to the seaside?
A. It was bad B. It was rainy C. It was snowy D. It was nice
4. How did they travel to the seaside?
A. By car B. By train C. By bus D. By air
5. When did they reach the seaside?
A. At 8 o’clock B. At 12 o’clock C. At 4 p.m D. At 9 p.m
V. Choose the best word from the box to fill in each gap in the following passage. (1.0 point)
too | from | have | to live | destroying is |
We are all slowly (1) …destroying………… the earth. The sea and the rivers are (2) ………too……… dirty to swim in. There (3) ……is………so much smoke in the air that it is unhealthy (4) ………to live…………….in many of the world’s cities. In one well- known city, for example, the gases (5)……from…… cars pollute the air so much that traffic policemen (6) ………have…..to wear oxygen masks.
VI. Finish each of the following sentences in such a way that it means exactly the same as the sentence printed before it. (1.6 points)
1. " Do you like pop music?" he asked me.
-> He asked me if ............I liked pop music..................................................................
2. The flat's very noisy, but we enjoy living there.
-> Even though..............the flat's very noisy, we enjoy living there..........................................................
3. I am sorry that I can't come to your party.
-> I wish I .................could come to your party ...........................................................
4. Mary is reading an English novel. It is interesting.
-> The English novel which ……Mary is reading is interesting………………………………………
5. They were late for school because it rained heavily.
-> It rained ..............heavily so they were late for school..............................................................................................
6. Work hard or your parents will be unhappy.
® If you………work hard, your parents will be happy……………………………….
7. They grow rice in tropical countries
® Rice is………grown in tropical countries……………………………
8. It takes Minh 2 hours to do his homework every day.
® Minh spends ..........2 hours doing his homework every day............................................................
VII : Complete each of the following sentences, using the words given. (0.4 point)
1. If/ I/ meet/ alien/ outer space/ I/ invite/ home/ talk.
..........If I met an alien in outer space, I would invite him home to talk.................................................................................................................................
2. mom/ never/ travelled/ by/ air/ before.
...................Mom has never travelled by air before........................................................................................................................
AN
1
9 tháng 1 2022
a: =>|x-3|=4
\(\Leftrightarrow\left[{}\begin{matrix}x-3=4\\x-3=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-1\end{matrix}\right.\)
b: =>|x+2|=15
\(\Leftrightarrow\left[{}\begin{matrix}x+2=15\\x+2=-15\end{matrix}\right.\Leftrightarrow x\in\left\{13;-17\right\}\)
25 tháng 1 2017
Vì :
|x + 2| ≥ 0
|x + 5| ≥ 0
|x + 9| ≥ 0
|x + 11| ≥ 0
=> |x + 2| + |x + 5| + |x + 9| + |x + 11| ≥ 0
Hay 5x ≥ 0 => x ≥ 0
=> |x + 2| + |x + 5| + |x + 9| + |x + 11| = x + 2 + x + 5 + x + 9 + x + 11
= 4x + 27 = 5x
=> x = 27
Vậy x = 27
HAPPY NEW YEAR !!!
25 tháng 1 2017
Ta có :
\(\left|x+2\right|\ge0\)
\(\left|x+5\right|\ge0\)
\(\left|x+9\right|\ge0\)
\(\left|x+2\right|\ge0\)
KL
2
31 tháng 3 2020
Số đối của -5 là 5
Số đối của 0 là 0
Số đối của 2010 là -2010
Vì \(\left|-11\right|\)=11 nên số đối của \(\left|-11\right|\) là -11
2 tháng 4 2020
Số đối của các số:-5;0;2010;|-11| là 5;-0;-2010;-11
Chúc bn học tốt
Chọn D.
Ta có: z = -121 nên z = (11i)2 .
Do đó z có hai căn bậc hai là z = 11i và z = -11i.