Решите уравнения: A) 3,2(5x-1)=3,6x-9,4. Б) 1,2*(3K+5)=2*(2,4k-3,6)

A) 3,2 * (5 * x - 1) = 3,6 * x - 9,4; 

Найдем корешки. Скобки раскроем.  

3.2 * 5 * x - 3.2 * 1 = 3.6 * x - 9.4; 

16 * x - 3.2 = 3.6 * x - 9.4; 

16 * x - 3.6 * x = -9.4 + 3.2; 

13 * x - 0.6 * x = -6 - 0.2; 

12.4 * x = -6.2; 

x = -6.2/12.4; 

x = -0.5. 

Б) 1,2 * (3 * k + 5) = 2 * (2,4 * k - 3,6); 

1.2 * 3 * k + 1.2 * 5 = 2.4 * 2 * k - 2 * 3.6; 

3.6 * k + 6 = 4.8 * k - 7.2; 

3.6 * k - 4.8 * k = -7.2 - 6; 

-1.2 * k = -13.2; 

k = 13.2/1.2; 

k = 11.