помогите пожалуйста

1)




frac{3}{12} [/tex] / frac{1}{10} [/tex]=frac{30}{12} [/tex]=frac{5}{2} [/tex]
2) frac{3}{5} = frac{9}{15}
frac{9}{15} - frac{4}{15} = frac{5}{15}
frac{1}{2} = frac{2}{4}
frac{3}{4} - frac{2}{4} = frac{1}{4}
frac{5}{15}/ frac{1}{4} = frac{5}{15} * frac{4}{1} = frac{20}{15} = frac{4}{3}
3) frac{1}{4} = frac{2}{8}
frac{1}{8}+frac{2}{8}=frac{3}{8}
frac{2}{3}= frac{4}{6}
frac{5}{6} + frac{4}{6} = frac{9}{6}
frac{3}{8} / frac{9}{6} = frac{18}{72} = frac{3}{12} = frac{1}{4}
4) frac{1}{6} = frac{3}{18}
frac{7}{18} + frac{3}{18} = frac{10}{18}
2 frac{1}{2} = frac{5}{2} = frac{15}{6}
frac{15}{6} + frac{5}{6} = frac{20}{6}
frac{10}{18} / frac{20}{6} = frac{60}{360} = frac{1}{6}