Вычислите 15 1/5-11 1/2

15.2-11.5=3.7 в десятичных 76/5-23/2=152/10-115/10=37/10=3 7/10=3.7

[latex]15 \frac{1}{5} -11 \frac{1}{2} =15 \frac{1*2}{5*2} -11 \frac{1*5}{2*5} =15 \frac{2}{10} -11 \frac{5}{10} = \\ \\ =14 \frac{10+2}{10} -11 \frac{5}{10} =14\frac{12}{10} -11 \frac{5}{10} =(14-11)+ \frac{12-5}{10} =3+ \frac{7}{10}= \\ \\ =3\frac{7}{10}=3,7[/latex]