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20 tháng 2 2020

ta có : 

8 =\(\frac{7.5+8.3+9.n+10.1}{5+3+n+1}\)

8 = \(\frac{69+9.n}{9+n}\)

suy ra 8(9+n)=69 +9n

---> 72+8n=69+9n

---> n=3

4 tháng 5 2020

Ta có

7*5+8*3+9*n+10*1/5+3+n+1=8

69+9n/9+n=8

>69+9n=8*(9+n)

>69+9n=72+8n

>n=80-78

N=2

Đề 4I. Supply the correct verbs form. (15 pts)1. Where is Tom? – I don’t know. I (not see)______ him this afternoon.2. He (spend)______ his free time (read)______ books every day.3. If you feel tired, please (lie)______ down for a moment and you (feel)______ better4. How much you (save)______ since Christmas? I (save)______ $5.5. I’m sure you are capable of (pass)______ the exam.6. When I’m on holiday, I enjoy (not have)______ (get)______ up early.7. The theater is quite old .It...
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Đề 4
I. Supply the correct verbs form. (15 pts)
1. Where is Tom? – I don’t know. I (not see)______ him this afternoon.
2. He (spend)______ his free time (read)______ books every day.
3. If you feel tired, please (lie)______ down for a moment and you (feel)______ better
4. How much you (save)______ since Christmas? I (save)______ $5.
5. I’m sure you are capable of (pass)______ the exam.
6. When I’m on holiday, I enjoy (not have)______ (get)______ up early.
7. The theater is quite old .It (build)______ over 100 years old.
8. It’s the first time he (win)______ the school prize.
9. When I (see)______ him, he (talk)______ to somebody so he (not recognize)______ me then.
II. Rewrite the following sentences that keep the same meaning. (10 pts)
1. I’m sorry now that I asked her to say. → Now I wish...........................................
2. Someone stole my purse from my handbag. → My purse.............................................
3. We couldn’t go out because the weather was so bad. → It was such.........................................
4 He could repair the broken vase. → The .......................................................
5. He is sorry now he didn’t invite us to his party. → He wishes...........................................
6. Although he had a good salary, he was unhappy in his job. → In spite.................................................
7. How about something to eat before the show. → Shall we...............................................
8. If you missed the program, you couldn’t really understand their intention. → Unless........................
9. I haven’t been able to see them for over a year. → It is ........................................................
10. He was so tired that he fell asleep before the end of the film. → He was too.........................................
III. Give the correct form of the words in brackets. (10 pts)
1. Your money will be refunded if the goods aren’t to your complete (satisfy)___________.
2. The book doesn’t say much about prices, but it is very (inform)___________ about everything else.
3. The (perform)___________ she gave last night was marvelous.
4. I’m looking for a (suit)___________ gift for an old lady.
5. He was given a light sentence because of his (young)___________.
6. Children need to have a good (educate)___________.
7. He should say a few words of (explain)___________.
8. Charities rely on (volunteer)___________ contributions.
9. We should save (nature)___________ resources.
10. They collected over 1000 (sign)___________ for the petition.
IV. Choose the correct words in brackets. (10 pts)
1. My dog is the (prettier/ prettiest) of the two.
2. This soup tastes (well/ good).
3. This map was of (a great use/ great use) to me on a trip.
4. He works much (more hard/ harder) than he used to .
5. I regretted (staying/ to stay) in the same job for a long time.
6. My mother is a very good (cook/ cooker).
7. Her father is (a/ an) university lecture.
8. My maths (is/ are) getting worse.
9. The others can’t come so you’ll have to come (alone/ lonely).
10. He was very (asleep/ sleepy) so he went to bed early.

V. Find the word or phrase that is SIMILAR in meaning to the underlined one. (5 pts)
1. They will board the ship in Genoa.
A. get in B. try at C. get into D. get off
2. We waited and waited and finally he arrived.
A. on end B. on the whole C. at last D. in general
3. The conductor will tell you where to leave the bus for the central market.
A. get on B. get out of C. get over D. get off
4. Please test this coast just for size.
A. try on B. try out C. put on D. take off
5. You should review this lesson again.
A. look at B. look up C. look over D. look out
VI. Find the word whose underlined part is pronounced different from others. (5 pts)
1. A. handed B. booked C. translated D. visited
2. A. car B. coach C. century D. cooperate
3. A. within B. without C. clothing D. strengthen
4. A. has B. bag C. dad D. made
5. A. kites B. catches C. oranges D. buzzes
VII. Choose the most suitable words or phrases to complete the sentences: (10 pts)
1. We________ the seedlings into peaty soil. A. take B. plough C. raise D. transplant
2. She got_________ as soon as the alarm clock went_________.
A. over/ on B. up/ down C. up/ off D. on/ off.
3. I'll see him when he______ here tomorrow.
A. comes B. will come C. has come D. had come
4. Maria is going to stop______ dinner, so she may be late.
A. eating B. to eat C. for eating D. eat
5. It's_______ to break into someone's home.
A. illegal B. legally C. legal D. illegally
6. Have you seen her__________? A. later B. lately C. late D. latter
7. We visited Canada and___________ United States. A. an B. a C.  D. the
8. We could reach the house__________ the road was flooded. A. although B. whether C. as if D. even
9. The scientist__________ invention was a success became famous.
A. who B. whose C. which D. that
10. John___________ a respectful and obedient student.
A. said to be B. is said C. is said being D. is said to be
VI. Complete the sentences with one suitable word in the box. (8 pts)

typhoon  drought   tragedy   urban   migrant   traffic   jam    remote     floods

1. In the areas affected by______ there is not enough water for peoples need.
2. The heavy rain has caused______ in many parts of the country.
3. A person who moves from one place to another to live or work is a______.
4. ______ is a tropical storm with strong winds.
5. Many young farmers moved to the______ areas for jobs.
6. Some______ areas in the country are getting electricity.
7. We were stuck in a______ for an hour.
8. It’s a______ that so many young people are out of work.
VII. Fill in the blank with a suitable preposition. (7 pts)
1. There are lots of parties____ Christmas.
2. I received a letter____ my friend yesterday.
3. She usually goes swimming____ Sunday morning.
4. Khoi is my close friend. I spend most of my free time____ him.
5. He does volunteer work____ a local hospital.
6. His friend didn’t laugh____ his jokes.
7. My friends usually enjoy my sense____ humor.

làm đc bài nào hay bài đó thanks ai lm xg tick 1000 cái

4
4 tháng 3 2020

I. Supply the correct verbs form. (15 pts)
1. Where is Tom? – I don’t know. I (not see)___didn't see___ him this afternoon.
2. He (spend)___spends___ his free time (read)___reading___ books every day.
3. If you feel tired, please (lie)__lie____ down for a moment and you (feel)__will feel____ better
4. How much you (save)___have you saved___ since Christmas? I (save)___have saved___ $5.
5. I’m sure you are capable of (pass)____passing__ the exam.
6. When I’m on holiday, I enjoy (not have)__not having____ (get)__to get____ up early.
7. The theater is quite old .It (build)___was built___ over 100 years old.
8. It’s the first time he (win)____has won__ the school prize.
9. When I (see)____saw__ him, he (talk)___was talking___ to somebody so he (not recognize)___didn't recognize___ me then.

4 tháng 3 2020

IV. Choose the correct words in brackets. (10 pts)
1. My dog is the (prettier/ prettiest) of the two.
2. This soup tastes (well/ good).
3. This map was of (a great use/ great use) to me on a trip.
4. He works much (more hard/ harder) than he used to .
5. I regretted (staying/ to stay) in the same job for a long time.
6. My mother is a very good (cook/ cooker).
7. Her father is (a/ an) university lecture.
8. My maths (is/ are) getting worse.
9. The others can’t come so you’ll have to come (alone/ lonely).
10. He was very (asleep/ sleepy) so he went to bed early.

20 tháng 2 2020

Hình: tự vẽ (nha anh lp trưởng) =.=

a, \(\Delta AHC\)có: \(\widehat{HAC}=180^o-\left(\widehat{AHC}+\widehat{C}\right)=180^o-120^o=60^o\)

b, *Áp dụng định lí Pytago vào \(\Delta ABH\),có:

\(AH^2=AB^2-BH^2\)

\(\Rightarrow AH^2=25-9=16\)

\(\Rightarrow AH=4\)(cm)

*Ta có: \(HC=BC-BH=10-3=7\)(cm)

* Theo đ/lí Pytago, có: \(AH^2+HC^2=AC^2\)

\(\Rightarrow16+49=AC^2\)

\(\Rightarrow AC^2=65\)

\(\Rightarrow AC=\sqrt{65}\)(cm)

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Forever

20 tháng 2 2020

 \(\text{A=|x| - |x-2| }\le|x-x+2|=2\)

=> MaxA=2 , dấu bằng xảy ra khi \(x\ge2\)

4 tháng 4 2020

dạo này dịch phát tán đi khắp nơi ai ai người người lo sợ không dám ra đường các công ty cũng nghỉ dần . những bà mẹ bỉm sữa không ra ngoài thường xuyên để mua đồ như trước nữa . chỉ số không khí cũng cải thiện đáng kể . các địa danh nổi tiếng cũng vắng tanh không có một ai . nhưng quán ăn , nhà hàng cũng phải đóng cửa . nhà cửa ai ai đóng im ỉm nom rất bí . những chú công an hoạt động nhiều hơn . những kẻ xấu nhân lúc thiếu hụt khổ trang đã bán cho các hộ dân khổ trang giả , khổ trang đã dùng rồi . các y bác sĩ trên toàn cầu đang thiếu giảm do tiếp súc với người bệnh . 

bai van cua em ve dich benh COVID-19 nham chan va ghet no

20 tháng 2 2020

Lời giải:

Tích của bốn số \(x^2-10,x^2-7,x^2-4,x^2-1\) là số âm nên phải có một hoặc ba số âm . Ta có : \(x^2-10< x^2-7< x^2-4< x^2-1\). Xét hai trường hợp :

Trường hợp 1: Có một số âm,ba số dương:

\(x^2-10< 0< x^2-7\Rightarrow7< x^2< 10\Rightarrow x^2=9\left(x\inℤ\right)\Rightarrow x=\pm3\)

Trường hợp 2: Có ba số âm,một số dương

\(x^2-4< 0< x^2-1\Rightarrow1< x^2< 4\)

Do \(x\inℤ\)nên không tồn tại số x

Vậy x = \(\pm\)3.

20 tháng 2 2020

Giải từng TH là ra, nhớ rằng âm nhân âm ra dương, âm nhân dương ra âm, để pt trên <0 thì cần 1 cặp dương, 1 cặp âm

20 tháng 2 2020

Giá tiền một ly trà sữa giảm lần thứ nhất là:

      20000-(20000.5%)=19000 (đồng)

Giá tiền một ly trà sữa giảm lần thứ hai là:

      19000-(19000.10%)=17100 (đồng)

          Vậy giá tiền của một ly trà sữa sau hai lần giảm là 17100 đồng.

2 tháng 11 2023

Ly trà sữa có giá gốc là 20.000đ một ly nhưng cửa hàng đã giảm 5% giá ly trà sữa nên : 100%-5%=95%

      20.000 × 95% = 19.000(đồng)

Lần thứ hai, cửa hàng lại giảm thêm 10% nữa sau khi giảm giá lần thứ nhất nên : 95%-10%=85%

19.000 × 85%= 17.100(đồng)

Vậy giá tiền của một ly trà sữa sau hai lần giảm giá là còn 17.100 đồng.