作业帮4.7.8.9.用这些数字做24点
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4.7.8.9.用这些数字做24点
4.7.8.9.用这些数字做24点
4.7.8.9.用这些数字做24点
4*(7-(9-8))=24
1: 4 × (7 + 8 - 9)
2: 4 × ((7 + 8) - 9)
3: 4 × (7 + (8 - 9))
4: 4 × (7 - 9 + 8)
5: 4 × ((7 - 9) + 8)
6: 4 × (7 - (9 - 8))
7: 4 × (8 + 7 - 9)
8: 4 × ((8 + 7) - 9)
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1: 4 × (7 + 8 - 9)
2: 4 × ((7 + 8) - 9)
3: 4 × (7 + (8 - 9))
4: 4 × (7 - 9 + 8)
5: 4 × ((7 - 9) + 8)
6: 4 × (7 - (9 - 8))
7: 4 × (8 + 7 - 9)
8: 4 × ((8 + 7) - 9)
9: 4 × (8 + (7 - 9))
10: (4 + 8) × (9 - 7)
11: 4 × (8 - 9 + 7)
12: 4 × ((8 - 9) + 7)
13: 4 × (8 - (9 - 7))
14: (7 + 8 - 9) × 4
15: ((7 + 8) - 9) × 4
16: (7 + (8 - 9)) × 4
17: (7 - 9 + 8) × 4
18: ((7 - 9) + 8) × 4
19: (7 - (9 - 8)) × 4
20: (8 + 4) × (9 - 7)
21: (8 ÷ (7 - 4)) × 9
22: 8 ÷ (7 - 4) × 9
23: 8 ÷ ((7 - 4) ÷ 9)
24: (8 + 7 - 9) × 4
25: ((8 + 7) - 9) × 4
26: (8 + (7 - 9)) × 4
27: (8 - 9 + 7) × 4
28: ((8 - 9) + 7) × 4
29: (8 - (9 - 7)) × 4
30: 8 × (9 ÷ (7 - 4))
31: 8 × 9 ÷(7 - 4)
32: (8 × 9) ÷ (7 - 4)
33: (9 - 7) × (4 + 8)
34: (9 ÷ (7 - 4)) × 8
35: 9 ÷ (7 - 4) × 8
36: 9 ÷ ((7 - 4) ÷ 8)
37: (9 - 7) × (8 + 4)
38: 9 × (8 ÷ (7 - 4))
39: 9 × 8 ÷(7 - 4)
40: (9 × 8) ÷ (7 - 4)
收起
4 × (7 + 8 - 9)
就别看我的了，楼上的比电脑还快。。。
(7+8-9)*4=24
1:((8+7)-9)*4
2:(9*8)/(7-4)
3:(9-7)*(8+4)
好多废话啊。。。楼上得，仔细看看还都是重复得呢。唉 多此一举啊。
4*(7+8-9)=24