Odpowiedź:
[tex]\huge\boxed{\boxed{\text{wynik}\longrightarrow5\frac{1}{6}}}[/tex]
Szczegółowe wyjaśnienie:
[tex]\frac{2}{5}\cdot(7\frac{1}{2}+5\frac{5}{12})=\frac{2}{5}\cdot(7\frac{1\cdot6}{2\cdot6}+5\frac{5}{12})=\frac{2}{5}\cdot(7\frac{6}{12}+5\frac{5}{12})=\\\\=\frac{2}{5}\cdot12\frac{11}{12}=\frac{2}{5}\cdot\frac{12\cdot12+11}{12}=\frac{2}{5}\cdot\frac{144+11}{12}=\frac{\not2^1}{\not5_1}\cdot\frac{\not155^{31}}{\not12_6}=\frac{31}{6}=5\frac{1}{6}[/tex]
