Решите уравнение 1) 18,6 + (x - 6,5) = 5 2) 1,4 * (4 у-3) = 7 3) 84,7: (x + 2,7) = 11

1) 18,6 + (x - 6,5) = 5;

Раскроем скобки.

18.6 + x - 6.5 = 5;

12.1 + x = 5;

x = 5 - 12.1;

x = - 7 - 0.1;

x = - 7.1.

2) 1,4 * (4 * у - 3) = 7;

4 * y - 3 = 7/1.4;

4 * y - 3 = 5;

4 * y = 3 + 5;

4 * y = 8;

y = 8/4;

y = 2.

3) 84,7 / (x + 2,7) = 11;

11 * (x + 2.7) = 84.7;

x + 2.7 = 84.7/11;

x + 2.7 = 7.7;

x = 7.7 - 2.7;

x = 7 - 2;

x = 5.