0,6(x -2)+4,6=0,4*(7+x)
0,6x - 1,2 + 4,6 = 2,8 + 0,4x
0,6x + 3,4 = 2,8 + 0,4x
0,6x - 0,4x = 2,8 - 3,4
0,2x = -0,6
x = -0,6 : 0,2
x = -3
ответ:В математике последовательность обозначают маленькой латинской буквой, а каждый отдельный ее элемент – той же буквой с числовым индексом равным порядковому номеру этого элемента.
То есть, если последовательность
3
;
6
;
12
;
24
;
48
…
обозначить как
a
n
, то можно записать, что
a
1
=
3
,
a
2
=
6
,
a
3
=
12
,
a
4
=
24
и так далее.
Пошаговое объяснение:Иными словами, для последовательности
a
n
=
{
3
;
6
;
12
;
24
;
48
;
96
;
192
;
384
…
}
.
порядковый номер элемента
1
2
3
4
5
6
7
8
…
обозначение элемента
a
1
a
2
a
3
a
4
a
5
a
6
a
7
a
8
…
значение элемента
3
6
12
24
48
96
192
384
…
The Weather in English
In English, we usually use it is when we talk about the weather.
This is normally: It is + adjective OR It is + verb-ing
It is + adjective = A description of the weather
It is sunny today.
It's hot and humid today.
It's a nice day today.
We can also say:
It is a + adjective + day (or morning/afternoon/night)
It's a fine day.
It's a windy afternoon.
It is + verb-ing = This type of weather is happening now.
It's drizzling outside.
It's snowing.
Take an umbrella, it's raining.
You can also use it is in different tenses
It was cold yesterday.
It will be cloudy tomorrow.
When you are learning vocabulary about the weather, it is important to remember that some of the words have a noun form, a verb form and/or an adjective form. For example:
Rain: (noun) The game was cancelled because of the rain.
Rain: (verb) I think it is going to rain later.
Rainy: (adjective) It's a rainy day.
It pays to learn the different forms of each word and when they are used.
0,6х-1,2+4,6-2,8-0,4х=0
0,2х=0,6
2х=6
х=3