Question

Выполните умножение дробей и натуральных чисел 2/9×4, 2×9/20,4/15×8

Answer 1

$\tt\displaystyle\frac{2}{9}*4=\frac{2*4}{9}=\frac{8}{9}\\\\2*\tt\displaystyle\frac{9}{20}=\frac{2*9}{20}=\frac{18}{20}=\frac{18:2}{20:2}=\frac{9}{10}\\\\\tt\displaystyle\frac{4}{15}*8=\frac{4*8}{15}=\frac{32}{15}=\frac{30+2}{15}=2\frac{2}{15}$