Номер 200 плиз !!! Как можно скорее

1)a=2
$\frac{2}{5} = \frac{6}{15} \\ \frac{2*3}{5*3} = \frac{6}{15} \\ \frac{6}{15}=\frac{6}{15}$
2) a=48
$\frac{1}{12}= \frac{4}{48} \\ \frac{1*4}{12*4} = \frac{4}{48} \\ \frac{4}{48}=\frac{4}{48}$
3)a=10
$\frac{56}{70} = \frac{8}{10} \\ \frac{56:7}{70:7} = \frac{8}{10} \\ \frac{8}{10} =\frac{8}{10}$
4) a=72
$\frac{72}{60} = \frac{6}{5} \\ \frac{72:12}{60:12} = \frac{6}{5} \\ \frac{6}{5} =\frac{6}{5}$