Question

умоляю помогите, обыкновенные дроби.
очень срочно!

Answer 1

Ответ:

$a) \frac{1}{3} + \frac{5}{7} = \frac{7 + 15}{21} = \frac{22}{21}$

$b) \frac{5}{12} + \frac{7}{18} = \frac{15 + 14}{36} = \frac{29}{36}$

$c) \frac{7}{11} - \frac{5}{9} = \frac{63 - 55}{99} = \frac{8}{99}$

$d) \frac{3}{9} - \frac{5}{12} = \frac{1}{3} - \frac{5}{12} = \frac{4 - 5}{12} = \frac{ - 1}{12} = - \frac{1}{12}$

$e) \frac{4}{9} \times \frac{12}{24} = \frac{4}{9} \times \frac{1}{2} = \frac{2}{9}$

$f) \frac{5}{18} \times \frac{24}{30} = \frac{1}{18} \times \frac{24}{6} = \frac{1}{3} \times \frac{4}{6} = \frac{1}{3} \times \frac{2}{3} = \frac{2}{9}$