Пожалуста помогите ! дам 17. Created by Nastyakih1. matematika-ru

Пожалуста помогите ! дам 17...

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14) 1,2 - х = -0,8 16) 1 : 4 = 3 : (х + 2) 18) 7 - 2х = 3(х - 1)
х = 1,2 - (-0,8) х + 2 = 3 · 4 7 - 2х = 3х - 3
х = 1,2 + 0,8 х + 2 = 12 -2х - 3х = - 3 - 7
х = 2 х = 12 - 2 -5х = -10
х = 10 х = 2
20) -(3х - 1) + 0,5 = 1,5х
-3х + 1 + 0,5 = 1,5х
-3х + 1,5 = 1,5х
-3х - 1,5х = -1,5
-4,5х = -1,5
х = 1,5 : 4,5
х = 1/3

2 votes Thanks 2

sedinalana

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14
1,2-x=-0,8
x=1,2+0,8
x=2
16
1:4=3:(x+2)
x+2=3*4
x=12-2
x=10
18
7-2x=3x-3
3x+2x=7+3
5x=10
x=10:5
x=2
20
-3x+1+0,5=1,5x
1,5x+3=1,5
4,5x=1,5
x=1,5:4,5
x=1/3

0 votes Thanks 1

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