第一个:6 ÷ ((5 ÷ 4) - 1) 第二个: 4 ÷ (1 - 5 ÷ 6)第三个: 4 ÷ (1 - (5 ÷ 6))第四个: 6 ÷ (5 ÷ 4 - 1)
1: 4 ÷ (1 - 5 ÷ 6)2: 4 ÷ (1 - (5 ÷ 6))3: 6 ÷ (5 ÷ 4 - 1)4: 6 ÷ ((5 ÷ 4) - 1)
6/(5/4-1)=24