Ответы и объяснения

2014-04-07T07:01:43+00:00
5*5/9 - 1/2*5/9 - 1/3*5 + 1/2*1/3=
=5/9*(5-1/2) - 1/3*(5+1/2)=
=5/9*4 1/2 - 1/3*5 1/2 =
=5/9*9/2 - 1/3*11/2=
=5/2 - 11/6=
=15/6 - 11/6= 4/6= 2/3