请你选用下面2 4 7 8四张扑克牌上的数,用“加 减 乘 除”和（ ）组成算式,使计算结果等于24.

1:(2 × 7 - 8) × 4
2:((2 × 7) - 8) × 4
3:4 × (2 × 7 - 8)
4:4 × ((2 × 7) - 8)
5:4 × (7 × 2 - 8)
6:4 × ((7 × 2) - 8)
7:4 × 7 - 8 ÷ 2
8:(4 × 7) - 8 ÷ 2
9:4 × 7 -(8 ÷ 2)
10:(4 × 7) - (8 ÷ 2)
11:(7 × 2 - 8) × 4
12:((7 × 2) - 8) × 4
13:7 ÷ 2 × 8 - 4
14:(7 ÷ 2) × 8 - 4
15:(7 ÷ 2 × 8) - 4
16:((7 ÷ 2) × 8) - 4
17:(7 ÷ (2 ÷ 8)) - 4
18:7 ÷ (2 ÷ 8) - 4
19:7 × 4 - 8 ÷ 2
20:(7 × 4) - 8 ÷ 2
21:7 × 4 -(8 ÷ 2)
22:(7 × 4) - (8 ÷ 2)
23:7 × 8 ÷ 2 - 4
24:(7 × 8) ÷ 2 - 4
25:(7 × 8 ÷ 2) - 4
26:((7 × 8) ÷ 2) - 4
27:(7 × (8 ÷ 2)) - 4
28:7 × (8 ÷ 2) - 4
29:8 ÷ 2 × 7 - 4
30:(8 ÷ 2) × 7 - 4
31:(8 ÷ 2 × 7) - 4
32:((8 ÷ 2) × 7) - 4
33:(8 ÷ (2 ÷ 7)) - 4
34:8 ÷ (2 ÷ 7) - 4
35:8 × 7 ÷ 2 - 4
36:(8 × 7) ÷ 2 - 4
37:(8 × 7 ÷ 2) - 4
38:((8 × 7) ÷ 2) - 4
39:(8 × (7 ÷ 2)) - 4
40:8 × (7 ÷ 2) - 4