Question

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。

Answer 1

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