Выражением:
(5/6 +3/4) : 2 2/3 + 1 3/4 : ( 2 1/2 - 2/5 ) =
= (10/12 + 9/12 ) : 8/3 + 7/4 : ( 2 5/10 - 4/10 ) =
= 19/12 * 3/8 + 7/4 * 10/21=
=(19*1)/(4*8) + (7*10) / (4*21)=
=19/32 + (1*5)/(2*3) = 19/32 + 5/6=
=(19*3+5*16) / 96 = (57+80)/96=
=137/96 = 1 41/96
по действиям:
1) 5/6 +3/4 = 10/12 + 9/12 = 19/12 = 1 7/12
2) 2 1/2 - 2/5 = 2 5/10 - 4/10 = 2 1/10
3) 1 7/12 : 2 2/3 = 19/12 : 8/3 = 19/12 * 3/8 =
= 19/32
4) 1 3/4 : 2 1/10 = 7/4 : 21/10 = 7/4 * 10/21 =
= (1*5)/(2*3) = 5/6
5) 19/32 + 5/6 = 57/96 + 80/96 = 1 41/96