1: 5 × (5 - 1 ÷ 5)2: 5 × (5 - (1 ÷ 5))3: (5 - 1 ÷ 5) × 54: (5 - (1 ÷ 5)) × 51: 8 ÷ (3 - 8 ÷ 3)2: 8 ÷ (3 - (8 ÷ 3))
5×(5-1÷5)=248÷(3-8÷3)=24