Question

ajutor.Urgent.Va rog ​

Answer 1

$a) \: \frac{4}{5} \times \frac{3}{7} = \frac{12}{35}$

$b) \: \frac{14}{9} \times \frac{6}{21} = \frac{84}{189}$

$c) \: 9 \times \frac{5}{12} = \frac{45}{12}$

$d) \: 2 \frac{4}{5} \times \frac{15}{28} = \frac{2 \times 5 + 4}{5} \times \frac{15}{28} \\ = \frac{14}{5} \times \frac{15}{28} = \frac{210}{140}$

$e) \: 2 \frac{2}{5} \times 2 \frac{1}{12} = \frac{2 \times 5 + 2}{5} \times \frac{2 \times 12 + 1}{12} \\ = \frac{12}{5} \times \frac{25}{12} = \frac{300}{60}$