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18 tháng 9 2020

''suất sỉ'' phải là ''xấp xỉ'' nha bạn :)

1 tháng 10 2020

..........

18 tháng 9 2020

\(\text{Gọi số câu mà tae... trả lời đúng là x; trả lời sai là y, ta có: }\)

\(\hept{\begin{cases}x+y=10\\7x-3y=50\end{cases}\Rightarrow\hept{\begin{cases}3x+3y=30\\7x-3y=50\end{cases}\Rightarrow}}\hept{\begin{cases}3x-30=-3y\left(1\right)\\7x-3y=50\left(2\right)\end{cases}}\)

\(\text{Thay }-3y=3x-30\text{ ở (1) vào (2), ta được }:\)

\(7x+\left(3x-30\right)=50\Rightarrow10x-30=50\Rightarrow x=8\Rightarrow y=2\)

\(\text{Vậy teakwon trả lời đúng 8 câu, sai 2 câu }\)

18 tháng 9 2020

 bài giải 

nếu tea kwon làm đúng hết tất cả số câu thì anh ấy được số điểm là :

          10 * 7 = 70 ( điểm )

mỗi câu sai bị trừ số điểm so với câu đúng là :

                     3 + 7 = 10 ( điểm )

số điểm anh làm mất là :

       70 - 50 = 20 ( điểm )

số câu anh làm sai là :

           20 : 10 = 2 ( câu )

số câu anh làm đúng là :

           10 - 2 = 8 ( câu )

đáp số : 8 câu 

12 tháng 1 2022

A B

1 lost my money a) so I couldn't buy anything

2 she likes you a lot b) because she thinks you are very intelligent

3 I looked for the key e) but I just couldn't find it

4 My friends were ill c) and had to stay at home

5 The film starts at ten f) so we couldn't be home by eleven

6 I got good marks on the test d) because I studied very hard

12 tháng 1 2022

1. e 
2. a
3. b
4. c
5. f
6. d

21 tháng 1 2018

III. Make questions for the underlines of answers. (3 marks)

1. How long did we stay in Da Lat?

2. How did she visit to Nha Trang?

3. Where did they see many types of fish and turtles?

4. What did you eat for breakfast this morning?

5. When were they in the countryside?

6. What did Nga make for her mother?

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 38 to 42. History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale...
Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 38 to 42.

History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale orchestra; large movie theatres could buy sound-effect machines. Research into sound that was reproduced at exactly at the same time as the pictures - called “synchronized sound” – began soon after the very first films were shown. With synchronized sound, characters on the movie screen could sing and speak. As early as 1896, the newly invented gramophone, which played a large disc carrying music and dialogue, was used as a sound system. The biggest disadvantage was that the sound and pictures could become unsynchronized if, for example, the gramophone needle jumped or if the speed of the projector changed. This system was only effective for a single song or dialogue sequence.

In the “sound-on-film” system, sound was recorded as a series of marks on celluloid which could be read by an optical sensor. These signals would be placed on the film alongside the image, guaranteeing synchronization. Short feature films were produced in this way as early as 1922. This system eventually brought us “talking pictures”.

The word “screenings” is closest in meaning to  ____________ ”.

A. revelations

B. projections

C. diversions 

D. demonstrations

1
7 tháng 5 2019

Chọn B

Dịch nghĩa: Từ “screenings” gần nghĩa nhất với ________.

A.  sự phát hiện

B.  sự chiếu phum

C.  sự đa dạng

D.  sự trình bày

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 38 to 42. History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale...
Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 38 to 42.

History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale orchestra; large movie theatres could buy sound-effect machines. Research into sound that was reproduced at exactly at the same time as the pictures - called “synchronized sound” – began soon after the very first films were shown. With synchronized sound, characters on the movie screen could sing and speak. As early as 1896, the newly invented gramophone, which played a large disc carrying music and dialogue, was used as a sound system. The biggest disadvantage was that the sound and pictures could become unsynchronized if, for example, the gramophone needle jumped or if the speed of the projector changed. This system was only effective for a single song or dialogue sequence.

In the “sound-on-film” system, sound was recorded as a series of marks on celluloid which could be read by an optical sensor. These signals would be placed on the film alongside the image, guaranteeing synchronization. Short feature films were produced in this way as early as 1922. This system eventually brought us “talking pictures”.

The passage is mainly about the ________.

A. development of sound with movies. 

B. disadvantages of synchronized sound. 

C. research into sound reproduction.

D. history of silent movies.

1
22 tháng 6 2017

Chọn A

Đáp án B, C, D chỉ được nhắc đến như một phần nhỏ trong bài văn.

Dịch nghĩa: Bài văn chủ yếu nói về _________.

A.  sự phát triển của âm thanh với phim.

B.  nhược điểm của âm thanh đồng bộ hoá.

C.  nghiên cứu về sự tái tạo âm thanh.

D.  lịch sử của phim im lặng.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 53 to 62.History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale orchestra;...
Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 53 to 62.

History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale orchestra; large movie theatres could buy sound-effect machines. Research into sound that was reproduced at exactly at the same time as the pictures – called “synchronized sound” – began soon after the very first films were shown. With synchronized sound, characters on the movie screen could sing and speak. As early as 1896, the newly invented gramophone, which played a large disc carrying music and dialogue, was used as a sound system. The biggest disadvantage was that the sound and pictures could become unsynchronized if, for example, the gramophone needle jumped or if the speed of the projector changed. This system was only effective for a single song or dialogue sequence.

In the “sound-on-film” system, sound was recorded as a series of marks on celluloid which could be read by an optical sensor. These signals would be placed on the film alongside the image, guaranteeing synchronization. Short feature films were produced in this way as early as 1922. This system eventually brought us “talking pictures”.

The passage is mainly about the _________.

A. history of silent movies                        

B. disadvantages of synchronized sound

C. development of sound with movies                 

D. research into sound reproduction

1
17 tháng 9 2019

Chọn C
Dựa vào nội dung ở toàn bài để trả lời câu hỏi ( nên làm câu hỏi khái quát này sau cùng)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 38 to 42. History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale...
Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 38 to 42.

History books recorded that the first film with sound was The Jazz Singer in 1927. But sound films, or talkies, did not suddenly appear after years of silent screenings. From the earliest public performances in 1896, films were accompanied by music and sound effects. These were produced by a single pianist, a small band, or a full-scale orchestra; large movie theatres could buy sound-effect machines. Research into sound that was reproduced at exactly at the same time as the pictures - called “synchronized sound” – began soon after the very first films were shown. With synchronized sound, characters on the movie screen could sing and speak. As early as 1896, the newly invented gramophone, which played a large disc carrying music and dialogue, was used as a sound system. The biggest disadvantage was that the sound and pictures could become unsynchronized if, for example, the gramophone needle jumped or if the speed of the projector changed. This system was only effective for a single song or dialogue sequence.

In the “sound-on-film” system, sound was recorded as a series of marks on celluloid which could be read by an optical sensor. These signals would be placed on the film alongside the image, guaranteeing synchronization. Short feature films were produced in this way as early as 1922. This system eventually brought us “talking pictures”.

The phrase “these signals” refers to ___________.

A. series

B sounds

C. marks

D. sensors

1
29 tháng 4 2017

Chọn C

Dịch nghĩa:  Cụm “these signals” nhắc tới ________.

A.  chuỗi

B.  âm thanh

C.  dấu hiệu

D.  cảm ứng