Question

4 7/8 разделить на 3,9=
Решите пож

Answer 1

$3,9=3 \frac{9}{10} \\ 4 \frac{7}{8} :3 \frac{9}{10} =\frac{8*4+7}{8} : \frac{3*10+9}{10} =\frac{39}{8} : \frac{39}{10} =\frac{39}{8} * \frac{10}{39} =\frac{39}{4*2} * \frac{5*2}{39} =\frac{1}{4} * \frac{5}{1} = \frac{5}{4} = \\ =1,25$