Question

Помогите пожалуйста !!!

Answer 1

$1)\; \; 2\dfrac{4}{5}-\dfrac{2}{9}:\dfrac{10}{27}=\dfrac{14}{5}-\dfrac{2}{9}\cdot \dfrac{27}{10}=\dfrac{14}{5}-\dfrac{3}{5}=\dfrac{14-3}{5}=\dfrac{11}{5}=2\dfrac{1}{5}\\\\\\\\2)\; \; 4,2\cdot 3,5:0,7=\dfrac{4,2\, \cdot \, 3,5}{0,7}=\dfrac{4,2\, \cdot \, 35}{7}=4,2\cdot 5=21$