Question

Решите уравнения:
а) 1,6(x-3)=0,8(x-5)
б) |5x-3|=7
(5x-3 в модуле)​

Answer 1

Ответ:

$1.6(x - 3) = 0.8(x - 5) \\ 1.6x - 4.8 = 0.8x - 4 \\ 0.8x = 0.8 \\ x = 1$

$|5x - 3| = 7 \\ 5x - 3 = 7 \\ 5x = 10 \\ x = 2 \\ 5x - 3 = - 7 \\ 5x = - 4 \\ x = - \frac{4}{5}$