1:2 × (3 × 7 - 9) 2:2 × ((3 × 7) - 9) 3:2 × (7 × 3 - 9) 2*(7+9)8 4:2 × ((7 × 3) - 9) 5:3 ÷ 2 ×(7 + 9) 6:(3 ÷ 2) × (7 + 9) 7:3 ÷ (2 ÷ (7 + 9)) 8:3 ÷ 2 ×(9 + 7) ...
用9,5,7,6列出得数是24的算式
1:2 × (3 × 7 - 9) 2:2 × ((3 × 7) - 9) 3:2 × (7 × 3 - 9) 2*(7+9)8 4:2 × ((7 × 3) - 9) 5:3 ÷ 2 ×(7 + 9) 6:(3 ÷ 2) × (7 + 9) 7:3 ÷ (2 ÷ (7 + 9)) 8:3 ÷ 2 ×(9 + 7) ...