Решите уравнения. а)0,4x-6=-12; б)x+6=5+4x; в)13-3(x+1)=4-5x; г)0,2(3x-5)-0,3(x-1)=-0,7.

Question

Решите уравнения. а)0,4x-6=-12; б)x+6=5+4x; в)13-3(x+1)=4-5x; г)0,2(3x-5)-0,3(x-1)=-0,7.

Answer 1

а) 0,4х = -6

x = -15

 

б) x + 6 = 5 + 4x

x - 4x = 5 - 6

-3x = -1

x = 1/3

 

в) 13 - 3x - 3 = 4 - 5x

-3x + 5x = 4 + 3 - 13

2x = -6 

x = -3

 

г) 0.6x - 1 -0.3x +0.3 = -0.7

0.6x -0.3x = -0.7 +0.3x + 1

0.3x = 0.6x

x = 2

Answer 2

а)4х+60=0 х=-15

б)3х=1 х=1\3

в)13-3х-3=4-5х 2х=-6 х=-3

г) 0.6х-1-0.3х+1=-0.7 0.3х=-0.7 3х=-7 х=-7\3