Question

Помогите пожалуйста !!!

Answer 1

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