Question

ПОМОГИТЕ РЕШИТЬ ПРИМЕРЫ ПОЖАЛУЙСТА! !!
7*(2/3); (4/9)
23/45:(2/5-2/15)​

Answer 1

$7 \times \frac{2}{3} \div \frac{4}{9} =\frac{14}{3} \div \frac{4}{9} = \\ = \frac{14}{3} \times \frac{9}{4} = \frac{7 \times 3}{1 \times 2} = \frac{21}{2} = 10 \frac{1}{2} .$

$\frac{23}{45} \div ( \frac{2}{5} - \frac{2}{15})= \\ = \frac{23}{45} \div ( \frac{6}{15} - \frac{2}{15})= \\ = \frac{23}{45} \div \frac{4}{15} = \frac{23}{45} \times \frac{15}{4} = \\ = \frac{23 \times 1}{3 \times 4} = \frac{23}{12} = 1 \frac{11}{12} .$