i forgot this exercise, so every one let help me, please and thank you
Cho a,b,c>0. CMR sigma\(\frac{a}{a^2+c+1}\le1\)
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HV
7 tháng 12 2021
1. Could you do me a favor, please? – …………………
A. Let me help you. B. Yes, go ahead!
C. No, thanks. I’m fine. D. Sure. What can I do for you?
2. I love this city. The …………………of the city impress me a lot.
A. views B. sights C. places D. faces
3. Messages that are received or sent on a computer are ………………….
A. information B. e-mail C. data D. texts
4. The weather is nice. Shall we …………………mountains this morning?
A. go B. come C. climb D. travel
5. Let me congratulate you on passing the examination. – …………………
A. Yes, let’s. B. Not at all.
C. I’m sorry. I can’t. D. It’s nice of you to say so.
6. A computer can help us to …………………with people around the world.
A. respond B. transmit C. interact D. contact
7. If you want to …………………your speaking, you should speak English with friends.
A. pass B. describe C. express D. improve
8. Learning a foreign language also includes learning the …………………of that country.
A. reputation B. scenery C. culture D. nature
9. She has two children to look after, so she’s looking for a …………………job in her neighborhood.
A. part-time B. full time C. skilled D. low-paid
10. For centuries, poets, writers and musicians have …………………bamboos in poems, novels and songs.
A. said B. told C. mentioned D. talked
* Choose the sentence - A, B, C or D - which is closest in meaning to the printed one.
1. Bob outdoes his brother Paul in Math.
A. Paul surpasses Bob in Math.
B. Bob surpasses Paul in Math.
C. Bob always does Paul’s Math for him.
D. Paul and Bob make the same grade in Math.
2. She tends to lose her temper for no reason.
A. She often gets angry for no reason.
B. She has no reason so she loses her temper.
C. She easily gets angry when there is a reason.
D. She has no reason for tending to lose her temper.
3. He liked London very little and Vienna less.
A. He liked Vienna but not London.
B. He liked Vienna more than London.
C. He thought Vienna was worse than London.
D. He didn’t like Vienna as much as London.
4. He seemed very reluctant to take my advice.
A. He seemed quite willing to take my advice.
B. He seemed very anxious to take my advice.
C. It seemed he was not ready to give me advice.
D. It seemed he was not willing to take my advice.
HV
7 tháng 12 2021
1. Could you do me a favor, please? – …………………
A. Let me help you. B. Yes, go ahead!
C. No, thanks. I’m fine. D. Sure. What can I do for you?
2. I love this city. The …………………of the city impress me a lot.
A. views B. sights C. places D. faces
3. Messages that are received or sent on a computer are ………………….
A. information B. e-mail C. data D. texts
4. The weather is nice. Shall we …………………mountains this morning?
A. go B. come C. climb D. travel
5. Let me congratulate you on passing the examination. – …………………
A. Yes, let’s. B. Not at all.
C. I’m sorry. I can’t. D. It’s nice of you to say so.
6. A computer can help us to …………………with people around the world.
A. respond B. transmit C. interact D. contact
7. If you want to …………………your speaking, you should speak English with friends.
A. pass B. describe C. express D. improve
8. Learning a foreign language also includes learning the …………………of that country.
A. reputation B. scenery C. culture D. nature
9. She has two children to look after, so she’s looking for a …………………job in her neighborhood.
A. part-time B. full time C. skilled D. low-paid
10. For centuries, poets, writers and musicians have …………………bamboos in poems, novels and songs.
A. said B. told C. mentioned D. talked
* Choose the sentence - A, B, C or D - which is closest in meaning to the printed one.
1. Bob outdoes his brother Paul in Math.
A. Paul surpasses Bob in Math.
B. Bob surpasses Paul in Math.
C. Bob always does Paul’s Math for him.
D. Paul and Bob make the same grade in Math.
2. She tends to lose her temper for no reason.
A. She often gets angry for no reason.
B. She has no reason so she loses her temper.
C. She easily gets angry when there is a reason.
D. She has no reason for tending to lose her temper.
3. He liked London very little and Vienna less.
A. He liked Vienna but not London.
B. He liked Vienna more than London.
C. He thought Vienna was worse than London.
D. He didn’t like Vienna as much as London.
4. He seemed very reluctant to take my advice.
A. He seemed quite willing to take my advice.
B. He seemed very anxious to take my advice.
C. It seemed he was not ready to give me advice.
D. It seemed he was not willing to take my advice.
6 tháng 12 2018
1...................How can I help you ?
a. Do you need any help ?
b, How may I help you
c. Let me help you
d. could you help me
2. Let me help you ?-.....................
a, no problem
b. no. thank you
c. thank you, I don't need
d. sure
3. I need a favor.-...................
a. no problem
b. what do you need
c. Yes. I know
d. No thank you
4. .............?- Certainly
a. do you help me ?
b. you don't mind helping me
c. can you help me
d. that's very kind of you
5. .................?- Yes. That's very kind of you
a. may I help you
b. Did you need any help
6. The red bicycle is not as expensive ...............the blue one
a. so
b. like
c. more
d. as
7. They're offering a 10%...........on all sofas this month
a. reward
b. discount
c. reduce
d. cut
8. Mr Brown is the same age............my father
a, as
b. like
c. from
d. with
9. Could you do me a favor, please ?
a, I can't help you
b, Sure. What can I do for you
c. Yes. Thank you
d. Luckily, I am really busy
10. Excuse me! I'm doing my homework,................turn down your radio a bit ?
a, would you like
b. why don't you
c. could you
d. would you mind
11. would you like to see a film?
a, yes I like
b. yes I do
c. Yes I will
d. Great!Let's go
S
15 tháng 4 2022
1. Here is their son’s telephone number; I don’t have _______.
A. their B. they C. theirs D. them
2. My father always _____ to help my mother with the housework.
A. to offer B. is offering C. offer D. offers
3. I _____ aerobics three times a week at my local gym.
A. play B. go C. do D. take
4. I’m on holiday in the mountains and it _______ yesterday. Everything is white.
A. snowed B. rained C. windy D. sunny
5. The food here is _______! I've never eaten such a delicious meal before.
A. terrifying B. terrified C. terrible D. terrific
you've forgot
we have
\(\frac{2a}{a^2+c+1}\le\frac{2a}{2a+c}=1-\frac{c}{2a+c}=1-\frac{c^2}{2ac+c^2}\)