3 / 5 × 4 / 3 + 2 / 5 + 1 = 4 / 5 + 2 / 5 + 5 / 5 = 11 / 5 = 2,2
[ 1,4 + 1,( 3 ) + 2 / 3 ] : 1 / 5 =
1,( 3) = ( 13 - 1) / 9 = 12 / 9 = 4 / 3
1,4 = 14 / 10 = 7 / 5
( 7 / 5 + 4 / 3 + 2 / 3 ) × 5 / 1 =
= ( 21 / 15 + 20 / 15 + 10 / 15) × 5 =
= 51 / 15 × 5 = 51 / 3 = 17
