Question

Помогите пожалуйста надо до12:00

Answer 1

$(1 \frac{2}{5} )^{2} \div \frac{2}{5} = (\frac{7}{5})^{2} \times \frac{5}{2} = \frac{49}{25} \times \frac{5}{2} = \frac{49}{5} \times \frac{1}{2} = \frac{49}{5} = 9 \frac{4}{5} = 9.8$

$1 \frac{2}{7} \div \frac{3}{49} = \frac{9}{7} \times \frac{49}{3} = \frac{3}{1} \times \frac{7}{1} = 3 \times 7 = 21$

$1 \frac{2}{3} \div 2 \frac{1}{5} = \frac{5}{3} \div \frac{11}{5} = \frac{5}{3} \times \frac{5}{11} = \frac{25}{33}$

$1 \frac{2}{3} \div 2 \frac{1}{5} \times \frac{11}{40} = \frac{5}{3} \times \frac{5}{11} \times \frac{11}{40} = \frac{5}{3} \times \frac{1}{1} \times \frac{1}{8} = \frac{5}{3} \times \frac{1}{8} = \frac{5}{24}$