(3 + 13) ÷ 4 × 6
(3 + 13) ÷ (4 ÷ 6)
(3 + 13) × 6 ÷ 4
(3 + 13) × (6 ÷ 4)
(13 + 3) ÷ 4 × 6
(13 + 3) ÷ (4 ÷ 6)
(13 + 3) × 6 ÷ 4
中秋节快乐!