[tex]7,8 : \frac{3}{4} = \frac{39}{5} : \frac{3}{4} = \frac{39}{5} * \frac{4}{3} = \frac{13}{5} * 4 = \frac{52}{5} = 10\frac{2}{5} = 10,4[/tex]
[tex]7,8 * \frac{3}{4} = \frac{39}{5} * \frac{3}{4} = \frac{117}{20} = 5\frac{17}{20} = 5.85[/tex]
10,4 - 5,85 = 4,55
