Вычислите:
2) 4/45 : (12/25-4/15)+15/16*4/15

1) $frac{12}{25}- frac{4}{15} = frac{36-20}{75}= frac{16}{75}$
2) $frac{4}{45}: frac{16}{75}= frac{4*75}{45*16}= frac{1*5}{3*4} = frac{5}{12}$
3) $frac{15}{16}* frac{4}{15} = frac{15*4}{16*15}= frac{1}{4}$
4) $frac{5}{12}+ frac{1}{4}= frac{5+3}{12}= frac{8}{12} = frac{2}{3}$