用2 3 7 8用加减乘除得24

:(2 + 7) ÷ 3 × 8
2:((2 + 7) ÷ 3) × 8
3:(2 + 7) ÷ (3 ÷ 8)
4:2 × (7 - 3 + 8)
5:2 × ((7 - 3) + 8)
6:2 × (7 - (3 - 8))
7:(2 + 7) × 8 ÷ 3
8:((2 + 7) × 8) ÷ 3
9:(2 + 7) × (8 ÷ 3)
10:2 × (7 + 8 - 3)
11:2 × ((7 + 8) - 3)
12:2 × (7 + (8 - 3))
13:(2 - 8) × (3 - 7)
14:2 × (8 - 3 + 7)
15:2 × ((8 - 3) + 7)
16:2 × (8 - (3 - 7))
17:2 × (8 + 7 - 3)
18:2 × ((8 + 7) - 3)
19:2 × (8 + (7 - 3))
20:(3 - 7) × (2 - 8)
21:(7 + 2) ÷ 3 × 8
22:((7 + 2) ÷ 3) × 8
23:(7 + 2) ÷ (3 ÷ 8)
24:(7 + 2) × 8 ÷ 3
25:((7 + 2) × 8) ÷ 3
26:(7 + 2) × (8 ÷ 3)
27:(7 - 3 + 8) × 2
28:((7 - 3) + 8) × 2
29:(7 - (3 - 8)) × 2
30:(7 - 3) × (8 - 2)
31:(7 + 8 - 3) × 2
32:((7 + 8) - 3) × 2
33:(7 + (8 - 3)) × 2
34:(8 - 2) × (7 - 3)
35:(8 × (2 + 7)) ÷ 3
36:8 × (2 + 7) ÷ 3
37:8 × ((2 + 7) ÷ 3)
38:8 ÷ 3 ×(2 + 7)
39:(8 ÷ 3) × (2 + 7)
40:8 ÷ (3 ÷ (2 + 7))
41:(8 - 3 + 7) × 2
42:((8 - 3) + 7) × 2
43:(8 - (3 - 7)) × 2
44:8 ÷ 3 ×(7 + 2)
45:(8 ÷ 3) × (7 + 2)
46:8 ÷ (3 ÷ (7 + 2))
47:(8 × (7 + 2)) ÷ 3
48:8 × (7 + 2) ÷ 3
49:8 × ((7 + 2) ÷ 3)
50:(8 + 7 - 3) × 2
51:((8 + 7) - 3) × 2
52:(8 + (7 - 3)) × 2
53:8 ÷ (7 ÷ 3 - 2)
54:8 ÷ ((7 ÷ 3) - 2)