Question

Решите уравнение :
1)  (2,8-х):0,3 = 5;
2) 0,39:х-0,1 = 0,16

Answer 1

(2.8 - х):0.3 = 5 | * 0.3
2.8 - x = 1.5
-x = 1.5 - 2.8
x = 1.3

0.39/x - 0.1 = 0.16 |*x
0.39 - 0.1x = 0.16x
-0.1x - 0.16x = -0.39
-0.26x = -0.39
x = 1.5

Answer 2

(2.8 +х):9=0.8 
2.8+х=0.8*9 
х=7.2+2.8 
х=10 

6у+3,7=38,5 
6y=34,8 
y=5,8



х=0,39/(0,16+0,1)=3/2=1,5 
вот