помогите пожалуйста вот это все от 19 до 32 дам 40 балов пжж как можно быстре пж и с пошаговым объеснение пж
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Ответы
Ответ:
Пошаговое объяснение:
19)
0,4*(x - 0,3) = 0,3*(x - 0,4)
0,4x - 0,12 = 0,3x = 0,12
0,4x - 0,3x = -0,12 + 0,12
0,1x = 0
x = 0
==========
20)
5*x = 2*(x + 1,5)
5x = 2x + 3
5x - 2x = 3
3x = 3
x = 1
===========
21)
4,4*(x + 4) = 5,5 * x
4,4x + 17,6 = 5,5x
5,5x - 4,4x = 17,6
1,1x = 17,6
x = 17,6 : 1,1
x = 16
======
22)
5*(x - 1) = 3*(x + 1)
5x - 5 = 3x + 3
5x - 3x = 3 + 5
2x = 8
x = 8 : 2
x = 4
========
23)
2*(2x - 1) = 1*(2x + 1)
4x - 2 = 2x + 1
4x - 2x = 1 + 2
2x = 3
x = 3 : 2
x = 1,5
=======
24)
9*(0,5x - 7) = 2*(2x + 1)
4,5x - 63 = 4x + 2
4,5x - 4x = 2 + 63
0,5x = 65
x = 65 : 0,5
x = 130
=========
25)
4*(0,2x - 1) = 3*(0,5x - 3)
0,8x - 4 = 1,5x - 9
1,5x - 0,8x = 9 - 4
0,7x = 5
x = 5 : 0,7
x = 7 1/7
==============
26)
6,5*(x - 2) = 1,5*(x - 3)
6,5x - 13 = 1,5x - 4,5
6,5x - 1,5x = 13 - 4,5
5x = 8,5
x = 8,5 : 5
x = 1,7
========
27)
5*(2x - 1,5) = 4*(3x - 4,5)
10x - 7,5 = 12x - 18
12x - 10x = 18 - 7,5
2x = 10,5
x = 10,5 : 2
x = 5,25
============
28)
6*(x - 2) = 2,5 * x
6x - 12 = 2,5x
6x - 2,5x = 12
3,5x = 12
x = 12 : 3,5
x = 3 3/7
=============
29)
7*x = 1*(2x + 3)
7x = 2x + 3
7x - 2x = 3
5x = 3
x = 3 : 5
x = 0,6
==========
30)
3*(4x + 3) = 2*(1,5x - 4)
12x + 9 = 3x - 8
12x - 3x = -8 - 9
9x = -17
x = -17 : 9
x = -1 8/9
==========
31)
4*(0,75x - 1) = 1*(2,5x + 1)
3x - 4 = 2,5x + 1
3x - 2,5x = 1 + 4
0,5x = 5
x = 5 : 0,5
x = 10
=========
32)
7*(2x - 3) = 4*(x - 1,5)
14x - 21 = 4x - 6
14x - 4x = 21 - 6
10x = 15
x = 15:10
x = 1,5