[ ( 1/2 + 2/3 + 5/6 ) : 7/12 - 2/5 × 5/6 ] × 1/4 : ( 5 × 12/25 - 4/3) =
= [ ( 3/6 + 4/6 + 5/6 ) : 7/12 - 1/3 ] × 1/4 : ( 12/5 - 4/3 ) =
= ( 12/6 × 12/7 - 1/3 ) × 1/4 : ( 36/15 - 20/15 ) =
= ( 24/7 - 1/3) × 1/4 : 16/15 =
= ( 72/21 - 7/21 ) × 1/4 × 15/16 =
= 65/21 × 1/4 × 15/16 =
= 325 / 448= 0,725