4 1/7 * 14 - 1 1/4 * 1 1/6 - 1 2/9 * 2 5/8 =
= (29 *14)/(7*1) - (5*7)/(4*6) - (11*21)/(9*8)=
= (29*2)/(1*1) - 35/24 - (11*7)/(3*8) =
= 58 - 1 11/24 - 3 5/24 =
= 58 - 4 16/24 = 58 - 4 2/3 = 53 1/3
1 31/32 * 3 1/5 + (8 5/9 * 6/35 + 3 8/15 ) * 7/50 =
= (63 *16) / (32*5) + ( (77*6)/(9*35) + 3 8/15) * 7/50=
= 6,3 + ( 22/15 + 53/15) * 0,14 =
= 6,3 + 5 *0,14 = 6,3 +0,7 = 7