3 Найдите корень уравнения: a) 7,2 - (z - 6,1) = 6,3; 6) Galaxy A32 5,3) = -3,4; r) - - (n - 1) = 10; д) 10-(18+)=;

Ответ: a) z = 7; б) s = - \(\frac{2}{3}\); в) n = -\(\frac{1}{72}\).

1. a) 7,2 - (z - 6,1) = 6,3;
• 7,2 - z + 6,1 = 6,3;
• 13,3 - z = 6,3;
• -z = 6,3 - 13,3;
• -z = -7;
• z = 7.
2. б) 7,2 - (z - 6,1) = 6,3;
3. в) \(-\frac{8}{9}\) - (n - 1) = \(\frac{7}{18}\)
• -\(\frac{8}{9}\) - n + 1 = \(\frac{7}{18}\)
• -n = \(\frac{7}{18}\) + \(\frac{8}{9}\) - 1
• -n = \(\frac{7}{18}\) + \(\frac{16}{18}\) - \(\frac{18}{18}\)
• -n = \(\frac{5}{18}\)
• n = -\(\frac{5}{18}\)
4. г) 1\(\frac{5}{9}\) - (s + \(\frac{4}{9}\)) = \(\frac{2}{3}\)
• \(\frac{14}{9}\) - s - \(\frac{4}{9}\) = \(\frac{2}{3}\)
• \(\frac{10}{9}\) - s = \(\frac{2}{3}\)
• -s = \(\frac{2}{3}\) - \(\frac{10}{9}\)
• -s = \(\frac{6}{9}\) - \(\frac{10}{9}\)
• -s = -\(\frac{4}{9}\)
• s = \(\frac{4}{9}\)

Ответ: a) z = 7; б) s = - \(\frac{2}{3}\); в) n = -\(\frac{1}{72}\).