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supermishanina
@supermishanina
March 2022
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Solнышко
1) 2-0,7х = 0,4 -0,3х
2-0,4 = 0,7х-0,3х
1,6 = 0,4х
х= 1,6 :0,4
х =4
2) 4(3х-2) = 5х-1
12х -8 = 5х-1
12х-5х = 8-1
7х = 7
х= 7:7
х = 1
3) 3(2х-1) =2х+4
6х-3 = 2х+4
6х -2х= 4 +3
4х = 7
х = 7/4
х= 1,75
4) 5х-(х +2,5) = 2х -8,5
5х -х -2,5 = 2х -8,5
5х -х -2 х = -8,5 +2,5
2х = - 6
х= -6 : 2
х= -3
5) 6-0,7(3х+40) = -х
6 -2,1х- 28 = -х
6-28 = -х +2,1х
-22 = 1,1 х
х = -22 : 1,1
х= 20
1 votes
Thanks 1
supermishanina
огромное спасибо!
supermishanina
5 по матике за контрооьную)))
Радость25
Решение смотри во вложении:
0 votes
Thanks 1
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Answers & Comments
2-0,4 = 0,7х-0,3х
1,6 = 0,4х
х= 1,6 :0,4
х =4
2) 4(3х-2) = 5х-1
12х -8 = 5х-1
12х-5х = 8-1
7х = 7
х= 7:7
х = 1
3) 3(2х-1) =2х+4
6х-3 = 2х+4
6х -2х= 4 +3
4х = 7
х = 7/4
х= 1,75
4) 5х-(х +2,5) = 2х -8,5
5х -х -2,5 = 2х -8,5
5х -х -2 х = -8,5 +2,5
2х = - 6
х= -6 : 2
х= -3
5) 6-0,7(3х+40) = -х
6 -2,1х- 28 = -х
6-28 = -х +2,1х
-22 = 1,1 х
х = -22 : 1,1
х= 20