57.4 ÷ 4 + 1 1/6 ÷ 4 - (2.7 + 5 1/20) × 0.8
= 14.35 + 1 1/6 ÷ 4 - (7.1) × 0.8= 14.35 + 1.1667 ÷ 4 - 5.68= 14.35 + 0.2917 - 5.68= 14.6417 - 5.68= 8.9617
57.4 ÷ 4 + 1 1/6 ÷ 4 - (2.7 + 5 1/20) × 0.8
= 14.35 + 1 1/6 ÷ 4 - (7.1) × 0.8
= 14.35 + 1.1667 ÷ 4 - 5.68
= 14.35 + 0.2917 - 5.68
= 14.6417 - 5.68
= 8.9617