Вычислите:
а) $+4\frac{2}{9} + 3\frac{5}{9}$;
б) $-4\frac{2}{9} - 3\frac{5}{9}$;
в) $4\frac{2}{9} - 3\frac{5}{9}$;
г) $-4\frac{2}{9} + 3\frac{5}{9}$;
д) $5\frac{7}{18} - 2\frac{11}{18}$;
е) $-5\frac{7}{18} - 2\frac{11}{18}$.
$+4\frac{2}{9} + 3\frac{5}{9} = (4 + 3) + (\frac{2}{9} + \frac{5}{9}) = 7 + \frac{7}{9} = 7\frac{7}{9}$
$-4\frac{2}{9} - 3\frac{5}{9} = (-4 - 3) + (-\frac{2}{9} - \frac{5}{9}) = -7 - \frac{7}{9} = -7\frac{7}{9}$
$4\frac{2}{9} - 3\frac{5}{9} = (4 - 3) + (\frac{2}{9} - \frac{5}{9}) = 1 + (-\frac{3}{9}) = \frac{9}{9} - \frac{3}{9} = \frac{6}{9} = \frac{2}{3}$
$-4\frac{2}{9} + 3\frac{5}{9} = (-4 + 3) + (-\frac{2}{9} + \frac{5}{9}) = -1 + \frac{3}{9} = -\frac{3}{3} + \frac{1}{3} = -\frac{2}{3}$
$5\frac{7}{18} - 2\frac{11}{18} = (5 - 2) + (\frac{7}{18} - \frac{11}{18}) = 3 + (-\frac{4}{18}) = 2\frac{9}{9} - \frac{2}{9} = 2\frac{7}{9}$
$-5\frac{7}{18} - 2\frac{11}{18} = (-5 - 2) + (-\frac{7}{18} - \frac{11}{18}) = -7 - \frac{18}{18} = -7 - 1 = -8$
Пожауйста, оцените решение