( 5 / 6 + 7 / 8 ) × 18 / 41 + 1 / 4 =
( 20 / 24 + 21 / 24 ) × 18 / 41 + 1 / 4 =
41 / 24 × 18 / 41 + 1 / 4 =
738 / 984 + 1 / 4 =
738 / 984 + 246 / 984 =
984 / 984 = 1
( 11 / 12 - 7 / 15 ) × 10 / 9 + 1 / 2 =
( 55 / 60 - 28 / 60 ) × 10 / 9 + 1 / 2 =
27 / 60 × 10 / 9 + 1 / 2 =
270 / 540 + 1 / 2 =
270 / 540 + 270 / 540 =
540 / 540 = 1