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19 tháng 3 2022

a) Dấu hiệu: Thời gian làm một bài tập của mỗi học sinh

b) Bảng tần số:

Giá trị(x)Tần số(n)
52
74
85
94
103
122

N=20

c) Số trung bình cộng: \(\dfrac{5.2+7.4+8.5+9.4+10.3+12.2}{20}=8,4\)

Mốt của dấu hiệu là 8.

19 tháng 3 2022

a) Dấu hiệu: Thời gian làm một bài tập của mỗi học sinh

b) Bảng tần số:

Giá trị(x)Tần số(n)
52
74
85
94
103
122

N=20

c) Số trung bình cộng: 5.2+7.4+8.5+9.4+10.3+12.220=8,45.2+7.4+8.5+9.4+10.3+12.220=8,4

Mốt của dấu hiệu là 8.

21 tháng 10 2021

Bài 3: 

1: Ta có: \(P=\dfrac{\sqrt{x}+1}{\sqrt{x}-2}+\dfrac{2\sqrt{x}}{\sqrt{x}+2}-\dfrac{5\sqrt{x}+2}{x-4}\)

\(=\dfrac{x+3\sqrt{x}+2+2x-4\sqrt{x}-5\sqrt{x}-2}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}\)

\(=\dfrac{\sqrt{x}}{\sqrt{x}+2}\)

14 tháng 2 2022

đoạn trích nào nhỉ

14 tháng 2 2022

đoạn trích nào vậy bạn

 

a: =>x+2013=0

hay x=-2013

b: =>50-x=0

hay x=50

có ai biết làm k hộ mình với mình đang cần rất rất gấp mong các bn giúp choII. Rewrite these sentences1.      This street is narrower than that oneÞ    That street ……………………………………………..Þ    That street …………………………………………………2. Linda drives more carefully than PeterÞ    Peter……………………………………………Þ    Peter…………………………………………………..3.Your car is more convenient than mineÞ    My car ……………………………………………………..Þ    My car……………………………………………………..4. We behave more politely than herÞ   ...
Đọc tiếp

có ai biết làm k hộ mình với mình đang cần rất rất gấp mong các bn giúp cho

II. Rewrite these sentences

1.      This street is narrower than that one

Þ    That street ……………………………………………..

Þ    That street …………………………………………………

2. Linda drives more carefully than Peter

Þ    Peter……………………………………………

Þ    Peter…………………………………………………..

3.Your car is more convenient than mine

Þ    My car ……………………………………………………..

Þ    My car……………………………………………………..

4. We behave more politely than her

Þ    She……………………………………………………….

Þ    She ………………………………………………………

5.I  cook better than my mother

Þ    my mother……………………………………………………………..

Þ    my mother ………………………………………………………………

6. Anna isn’t as confident as me

=> I …………………………………….

7. This book isn’t as boring as that one

Þ    That book …........................................................

8. I don’t work as effectively as he does

=> He ………………………………………….

9. My bedroom isn’t so comfortable as yours

Þ    Your bedroom……………………………..

10. John didn’t speak English as well as Mary

=> Mary ………………………………………….

11. Peter can dance the most gracefully in my city

=> No one………………………………………………….

=> No one………………………………………………

12. Kangaroo is the most unique animal in the world

=> No……………………………………………………..

=> No……………………………………………………….

13. No river in the world is longer than Nile

=> Nile …………………………………………………

14. No student in my class learns Maths more intelligently than John

=> John……………………………………………………………………

15. If you read many books, you will have much knowledge

→ The more …………………………………………………………………….

16. He speaks too much and people feel bored.

→ The more …………………………………………………………………….

III. Cirle the best option to complete each sentence:

1. The flower was.......... out of a single piece of valuable wood. 

A. carved              B. moulded       

C cast                   D. given

2. In this town, they_____ all the frames in steel.

A. make               B. have                     C. mould                    D. cast

3. She is skilled at ____ cloth.

A. giving               B. weaving                C doing                      D. carving 

4. If you like, I can_____ flowers on the cushion covers for you.

A. grow                B. make                    C. embroider               D. knit

5. Is it true that you.......... this woollen hat yourself?

A. knitted             B. wove                    C did                          D. carved

6. The doll has been.......... out of clay.

A. embroidered      B. cast                    C. woven                  D. moulded

7. I love going to this place _____ it's the quietest place in the city.

A. so                     B. though                  C. so that              D. as 

8. They keep changing the decoration of the shop_______ they can attract more young people.

A. so that              B. because                C. although           D when

9.________ he's young, she's the most famous artisan in the village.

A. When                B. Although                C. Whereas           D. In order to

10. Do you know who's______ his pottery workshop?

A. bring out           B. taking over            C. passing down    D. turning down

11. I've_______ the product catalogue and decided to buy this table.

A. found out          B. closed down            C. looked through   D. lived on

12. This sports centre is so small that it cannot______the demands of local residents.

A. keep up with        B. face up to            C. deal about            D. setup

13. When I turned up, the town hall was already_____ of teenagers.

A. full                   B. packed     C. crowded           D. jammed

14. She turned ______the new job in New York because she didn't want to move.

A. on                   B. down  C. off                   D. up

15. This city has one of the most___ underground rail networks in the world.

A. efficient                           B. fashionable   C . cosmopolitan                   D. fascinated

16. This laptop is much more user-friendly, but it costs________ the other one.

A. so much as                  B. as many as     C. twice as much as         D. twice as many

17. Today's cities are____than cities in previous times.

A. lots larger                  B. much larger    C. as large                     D. the largest

18. After I found all the information I needed, I________the computer.

 A. turned off                 B. switched on    C. looked for                  D. put off

19. Japan is the__________ developed country in the world.

A. most second             B. second in most        C. second most             D. two most

20. Factories and offices should be built in __________areas only.

A. rural                        B. Coastal      C. culture                     D. urban

21. My grandfather is _____ the oldest person in my village

A. by far                       B. a lot                    C. second                               D. much

22. The last runner tried ____ better than the first one

A. by far                           B. third                 C. a bit                  C, more

1
8 tháng 8 2021

ơ phần dưới s ko làm vậy e

8 tháng 8 2021

Có phần dưới ạ

17 tháng 2 2022

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