1: (1 - 4 + 7) × 6 2: ((1 - 4) + 7) × 6 3: (1 - (4 - 7)) × 6 4: (1 + 7 - 4) × 6 5: ((1 + 7) - 4) × 6 6: (1 + (7 - 4)) × 6 7: 4 ÷ (7 ÷ 6 - 1) 8: 4 ÷ ((7 ÷ 6) - 1) 9: 6 × (1 - 4 + 7) 10: 6 × ((1 - 4) + 7) 11: 6 × (1 - (4 - 7)) 12: 6 × (1 + 7 - 4) 13: 6 × ((1 + 7) - 4) 14: 6 × (1 + (7 - 4)) 15: 6 × (7 + 1 - 4) 16: 6 × ((7 + 1) - 4) 17: 6 × (7 + (1 - 4)) 18: 6 × (7 - 4 + 1) 19: 6 × ((7 - 4) + 1) 20: 6 × (7 - (4 - 1)) 21: (7 + 1 - 4) × 6 22: ((7 + 1) - 4) × 6 23: (7 + (1 - 4)) × 6 24: (7 - 4 + 1) × 6 25: ((7 - 4) + 1) × 6 26: (7 - (4 - 1)) × 6我用软件的、 但 按顺序，好像就没的、
