Question

даю 30 балов срочно(расписать надо)

Answer 1

4) $2\frac{1}{3} -1\frac{1}{2}$

Перемножаем 2 и 3:

$\frac{2*3+1}{3} - \frac{1*2+1}{2}$ = $\frac{7}{3} -\frac{3}{2}$

Приводим к общему знаменателю:

$\frac{14}{6} - \frac{9}{6}$ = $\frac{5}{6}$ = 0, 83

5) $1\frac{1}{7} + 2\frac{3}{28}$ = $\frac{7+1}{7} +\frac{2*28+3}{28} = \frac{8}{7} + \frac{59}{28} = \frac{32}{28} + \frac{59}{28} = \frac{91}{28} = \frac{13}{4} = 3,25$

6) $5\frac{1}{6} - 4\frac{1}{4} = \frac{30+1}{6} - \frac{16+1}{4} = \frac{31}{6} -\frac{17}{4} = \frac{62}{12} - \frac{51}{12} = \frac{11}{12} = 0, 916$

7) $\frac{1}{4} + \frac{1}{12} +\frac{2}{13} = \frac{3}{12} + \frac{1}{12} +\frac{2}{13} = \frac{4}{12} + \frac{2}{13} = \frac{1}{3} + \frac{2}{13} = \frac{13}{39} + \frac{6}{39} = \frac{19}{39} = 0, 48$