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0:00

Приветствие. Тема урока

0:12

Что такое высказывание

1:50

Логические операции И/ИЛИ/НЕ

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информатика

8 класс

высказывание

логика

логические операции

истина

ложь

и или не

видеоурок

урок

онлайн урок

8класс

онлайнурок

логическиеоперации

00:00:00

hello today's topic is

00:00:03

statement and logical operations

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and so what are

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statements, this is some

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declarative sentence about

00:00:18

which we can definitely say whether

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it is true or false and for

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example we can say now

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the sun is shining or we can say now it is

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raining, it is clear that both of these

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statements are simultaneously true

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cannot be, that is, now either it’s raining

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or the sun is shining, one of these

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statements will be true,

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otherwise it will be false, and so let’s take

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another more specific story,

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for example, twice two is equal to 5, this

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statement is definitely

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false,

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and if we take the statement twice

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4, it’s clear that it True,

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usually in computer science, a lie is denoted by

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0

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and a truth by one,

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it is clear that not all sentences in

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our Russian language, you can say about them whether

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they are true or false, for example, there is an

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interrogative sentence or there is, for

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example, we can tell someone stop,

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she won’t either true not false,

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it does not carry any information,

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but it carries information, but from the point of view of

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computer science it does not, in addition, in our

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human language with you, we use

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conjunctions, for example, we use the conjunction with you

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and and we use the conjunction with you either

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in logic or in computer science

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this called logical operations in

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our logic today we will get acquainted with

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three logical operations

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and it is also called

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logical multiplication or conjunction,

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it is designated by this angle upwards

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or uppers andam

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or it is designated by

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us and this is called logical

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addition it is

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also called disjunctions

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and not us this is a negation but,

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accordingly, this negation denotes

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it, that is, if we have some

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statement and then the statement

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negation a will be written like this, that

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is, we must put a line over the

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statement from above

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accordingly, let us also

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describe some declarative

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sentence, statement

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and Now we can combine these statements

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into larger statements

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with the help of our logical operations; we will

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denote

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this as a goal,

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respectively, if we now take and

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you with one conjunction and

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and b

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this expression will be false

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because if we have two expressions

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connected by the conjunction and or by logical

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multiplication for them to be true, both of our

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statements of which this

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large statement consists must be

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true, since our statement a is

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complex, then our entire large

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statement will also be false if we

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take our statement

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b and c, let me remind you that the statement c 2

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multiply by 3 equals 6 it is of course

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true

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and a statement consisting of a union of

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these two it will be true

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and let’s also look at our union or

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statement consisting of a or b here

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we need when we use a union

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or that at least one of the statements

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be true us statements b are

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true therefore a large statement

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consisting of a or b will also be true

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and add one more statement

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3 multiplied by 4 equals 10 this

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goat Vanya and is also false so let's

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write a large statement s or

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statements d or a is equal to zero

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because Well, that is, this statement is difficult for us

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because we have both statement d is

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false and statement a is false, that is,

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we do not have a single statement that

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is true and let’s also

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see how negation works,

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respectively, if we take the negation of a

00:05:51

and say that twice is two

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not equal to 5, that is, whether we are important or not, 2

00:05:57

is equal to 5, that is, we seem to add a

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particle not in this way, denying

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our statement, then it is clear that

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if we deny a false statement, it

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will be true

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and, accordingly, if we say

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2 is not equal to 4, that is, if we

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we already deny a true statement, then it

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will be false.

00:06:23

Today we learned what

00:06:26

logical operations are

Description:

Короткий видеоурок на тему "Высказывание и логические операции" Больше видеоуроков по информатике ЗДЕСЬ: https://www.youtube.com/playlist?list=PLRqVDT_WVZRlZFBMUnWLVN4fjEp1EUnNI Содержание урока: 0:00 Приветствие. Тема урока 0:12 Что такое высказывание 1:50 Логические операции И/ИЛИ/НЕ

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