Стр.138-139 Across the curriculum ГДЗ Комарова Ларионова 8 класс

Задача

Match the following binary digits (bits) to the equivalent decimal values.

1 $$101$$

2 $$10$$

3 $$1100$$

4 $$1001$$

5 $$11110$$

6 $$1010$$

7 $$11001000$$

8 $$1100000$$

a) 200

b) 12

c) 5

d) 10

e) 2

f) 96

g) 9

h) 30
Convert these decimal numbers to binary.
Information coded as eight binary digits make one byte.

a) Which number in exercise 1 is 1 byte?

b) How many bytes are there in a kilobyte (KB) of information?
Read the texts and choose the best title for each of them.
Are you familiar with any of the following words and acronyms? Use the information in the box to complete the texts below.

Windows, HTML, MP3, Linux, TIFF, Flash, HTM, jpg, zip, unzip
a) All computers are empty machines or hardware until software is installed with an operating system. There are three main operating systems for personal computers: Microsoft (1) ______ and OSX are operating systems which you pay for. (2) ______ is an Open Source operating system and it is available for free.
b) When files are very large or heavy they are difficult to send by email. A (6) ______ file is a file which has been compressed so that it is quicker and easier to send. When you receive one of these files you need to (7) ______ before you can access the files again.
c) Different types of information need to be stored in different types of files. Data information is stored in a different way from images or audio. For example, (3) ______ and (4) ______ are image files, whereas (5) ______ is an audio file.
d) (8) ______ and (9) ______ are used to create web pages by designers. (10) ______ is especially useful when designers want to include animation.

Project

You are going to find out about Wi-Fi zones in your town or in a place nearby.

Plan

Find a map of the town or area that you have chosen and think about the type of places that may have Wi-Fi zones (libraries, bus and train terminals, etc.).

Research

Find out about Wi-Fi zones in your town or in a town nearby.

Prepare

Mark the places on your map. Use this symbol:

Present your material

Show your completed project to your classmates and teacher.

Подробный ответ

1. 1–c, 2–e, 3–b, 4–g, 5–h, 6–d, 7–a, 8–f.

2. 5 = 101; 2 = 10; 12 = 1100; 9 = 1001; 30 = 11110; 10 = 1010; 200 = 11001000; 96 = 1100000.

3. a) 7 — это число состоит из 8 binary digits, значит, это 1 byte.
b) 1024 bytes — в 1 kilobyte (KB) 1024 bytes.

5. a) Microsoft Windows
b) Open Source
c) jpg and TIFF
d) HTML and HTM
e) Flash

Оцени решение