$frac{3}{14} * (1 frac{1}{2}14:28)+48 frac{3}{5} :6 frac{3}{4} frac{5}{12}$

По действиям:
1)1 $frac{1}{2}$ *14 = $frac{3*14}{2}$ = 21
2)21:28 = $frac{21}{28}$
3) $frac{3}{14}$ * $frac{21}{28}$ = $frac{9}{56}$
4)48 $frac{3}{5}$ :6 $frac{3}{4}$ = $frac{243*4}{5*27}$ = $frac{36}{5}$
5) $frac{36}{5}$ * $frac{5}{12}$ = $frac{36*5}{5*12}$ = 3
6) $frac{9}{56}$ +3 = $frac{9}{56}$ + $frac{168}{56}$ = $frac{177}{56}$ = 3 $frac{9}{56}$