1:(3 × (4 + 7)) - 9
2:3 × (4 + 7) - 9
3:3 × (4 × (9 - 7))
4:3 × 4 ×(9 - 7)
5:(3 × 4) × (9 - 7)
6:(3 × (7 + 4)) - 9
7:3 × (7 + 4) - 9
8:3 × 9 + 4 - 7
9:(3 × 9) + 4 - 7
10:(3 × 9 + 4) - 7
11:((3 × 9) + 4) - 7
12:3 × 9 +(4 - ...
共两种：
{1}3*9-7+4
{2}(3*4)*(9-7)
4*3*(9-7)
3*9-7+4
(3*4)*(9-7)
只能想到这两种了
1: (3 × (4 + 7)) - 9
2: 3 × (4 + 7) - 9
3: 3 × (4 × (9 - 7))
4: 3 × 4 ×(9 - 7)
5: (3 × 4) × (9 - 7)
6: (3 × (7 + 4)) - 9
7: 3 × (7 + 4) - 9
8: 3 × 9 + 4 - 7
9: ...
3*9-7+4=24
3*4*(9-7)=24
标签：二十四,四种
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