Question

Даю 20 балов решение и ответ​

Answer 1

Ответ:

$4)2.5x - 3.15 = 2.1 \\ 2.5x = 2.1 + 3.15 \\ 2.5x = 5.25 \\ x = 2.1$

$5)3.8z + 4.22z - 3.02z - 7.25 = 0 \\ 5z = 7.25 \\ z = 1.45$

$6)3.5x - x = x + 2.55 \\ 3.5x - x - x = 2.55 \\ 1.5x = 2.55 \\ x = 1.7$