Question

номер 339 (2,4) 2) (2-3/4-4/5)*20 4) (5/6+5/9)*18/25​

Answer 1

Ответ: 2) $(\frac{1}{4}-\frac{4}{5})*20=\frac{20}{4}-\frac{80}{5}=5-16=-11$

4) $\frac{5}{6}*\frac{18}{25}+\frac{5}{9}*\frac{18}{25}=\frac{3}{5}+\frac{2}{5}=\frac{5}{5}=1$