(4-4/7)*7就是4除以74 - 4 ÷ 7=24÷7再乘以7得24
1: (4 - 4 ÷ 7) × 72: (4 - (4 ÷ 7)) × 73: 7 × (4 - 4 ÷ 7)4: 7 × (4 - (4 ÷ 7))详细4 ÷ 7=4/74-4/7=24/724/7× 7=24
(4 - 4 ÷ 7) × 7