(1/4+7/6)*15/34+3/2*(1/3-1/21) =
=(3/12+14/12)*15/34+3/2*(7/21-1/21) =
=17/12*15/34+3/2*6/21 =
=15/24+3/7 =
=5/8+3/7 =
=35/56+24/56=
=59/56
0,5*[1/3+1/4-0,1(6)]:2,5=
0,1(6)=(16-1)/90=15/90=1/6
=0,5*[1/3+1/4-1/6]:2,5=
=0,5*[4/12+3/12-2/12]:2,5=
=5/10 *5/12:25/10=
=5/10 *5/12 *10/25=
=1/12=0,08(3)
