a ) (13+5/14+ 2/34)/3=
=(3094+85+14)/238*3=
=3193/714
b ) (4,49+17/20+5/12) /3=
=(449/100+17/20+5/12)/3=
=(1347+255+125)/300*3=
=1727/900=1,91(8)
c ) (32/79+5/59+ 5/16+15,(6)) /4=
= (32/79+5/59+ 5/16+141/9) /4=
=(32*59*16*9+5*79*16*9+5*79*59*9+141*79*59*16)/79*59*16*9*4=
=(271872+56880+209745+10515216)/2684736=11053713/2684736=
=3684571/894912