Ответ:
\[1.2:0.3=4.\]
\[\frac78-\frac1{16}=\frac{14}{16}-\frac1{16}=\frac{13}{16}.\]
\[\frac{4}{\left(\frac{13}{16}\right)\cdot3.2}=\frac{4}{\frac{13}{16}\cdot\frac{16}{5}}=\frac{4}{\frac{13}{5}}=\frac{20}{13}.\]
Ответ: \(\dfrac{20}{13}\).
\[1.2:0.3=4.\]
\[\frac78-\frac1{16}=\frac{14}{16}-\frac1{16}=\frac{13}{16}.\]
\[\frac{4}{\left(\frac{13}{16}\right)\cdot3.2}=\frac{4}{\frac{13}{16}\cdot\frac{16}{5}}=\frac{4}{\frac{13}{5}}=\frac{20}{13}.\]
Ответ: \(\dfrac{20}{13}\).