5 × (5 - 1 ÷ 5)=24
1: 5 × (5 - 1 ÷ 5)=242: 5 × [5 - (1 ÷ 5)]=243: (5 - 1 ÷ 5) × 5=244: [5 - (1 ÷ 5)] × 5=24
你好