用2、5、8、9四个数字用适当的运算符号和括号组成24，写出四种方法。
3个回答
展开全部
1: 2 + 5 + 8 + 9
2: (2 + 5) + 8 + 9
3: (2 + 5 + 8) + 9
4: ((2 + 5) + 8) + 9
5: (2 + (5 + 8)) + 9
6: 2 + (5 + 8) + 9
7: 2 + (5 + 8 + 9)
8: 2 + ((5 + 8) + 9)
9: 2 + (5 + (8 + 9))
10: 2 + 5 +(8 + 9)
11: (2 + 5) + (8 + 9)
12: 2 + 5 + 9 + 8
13: (2 + 5) + 9 + 8
14: (2 + 5 + 9) + 8
15: ((2 + 5) + 9) + 8
16: (2 + (5 + 9)) + 8
17: 2 + (5 + 9) + 8
18: 2 + (5 + 9 + 8)
19: 2 + ((5 + 9) + 8)
20: 2 + (5 + (9 + 8))
21: 2 + 5 +(9 + 8)
22: (2 + 5) + (9 + 8)
23: 2 + 8 + 5 + 9
24: (2 + 8) + 5 + 9
25: (2 + 8 + 5) + 9
26: ((2 + 8) + 5) + 9
27: (2 + (8 + 5)) + 9
28: 2 + (8 + 5) + 9
29: 2 + (8 + 5 + 9)
30: 2 + ((8 + 5) + 9)
31: 2 + (8 + (5 + 9))
32: 2 + 8 +(5 + 9)
33: (2 + 8) + (5 + 9)
34: (2 - 8) × (5 - 9)
35: 2 × (8 - 5 + 9)
36: 2 × ((8 - 5) + 9)
37: 2 × (8 - (5 - 9))
38: 2 + 8 + 9 + 5
39: (2 + 8) + 9 + 5
40: (2 + 8 + 9) + 5
41: ((2 + 8) + 9) + 5
42: (2 + (8 + 9)) + 5
43: 2 + (8 + 9) + 5
44: 2 + (8 + 9 + 5)
45: 2 + ((8 + 9) + 5)
46: 2 + (8 + (9 + 5))
47: 2 + 8 +(9 + 5)
48: (2 + 8) + (9 + 5)
49: 2 × (8 + 9 - 5)
50: 2 × ((8 + 9) - 5)
51: 2 × (8 + (9 - 5))
52: 2 + 9 + 5 + 8
53: (2 + 9) + 5 + 8
54: (2 + 9 + 5) + 8
55: ((2 + 9) + 5) + 8
56: (2 + (9 + 5)) + 8
57: 2 + (9 + 5) + 8
58: 2 + (9 + 5 + 8)
59: 2 + ((9 + 5) + 8)
60: 2 + (9 + (5 + 8))
61: 2 + 9 +(5 + 8)
62: (2 + 9) + (5 + 8)
63: 2 × (9 - 5 + 8)
64: 2 × ((9 - 5) + 8)
65: 2 × (9 - (5 - 8))
66: 2 + 9 + 8 + 5
67: (2 + 9) + 8 + 5
68: (2 + 9 + 8) + 5
69: ((2 + 9) + 8) + 5
70: (2 + (9 + 8)) + 5
71: 2 + (9 + 8) + 5
72: 2 + (9 + 8 + 5)
73: 2 + ((9 + 8) + 5)
74: 2 + (9 + (8 + 5))
75: 2 + 9 +(8 + 5)
76: (2 + 9) + (8 + 5)
77: 2 × (9 + 8 - 5)
78: 2 × ((9 + 8) - 5)
79: 2 × (9 + (8 - 5))
80: 5 + 2 + 8 + 9
81: (5 + 2) + 8 + 9
82: (5 + 2 + 8) + 9
83: ((5 + 2) + 8) + 9
84: (5 + (2 + 8)) + 9
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86: 5 + (2 + 8 + 9)
87: 5 + ((2 + 8) + 9)
88: 5 + (2 + (8 + 9))
89: 5 + 2 +(8 + 9)
90: (5 + 2) + (8 + 9)
91: 5 + 2 + 9 + 8
92: (5 + 2) + 9 + 8
93: (5 + 2 + 9) + 8
94: ((5 + 2) + 9) + 8
95: (5 + (2 + 9)) + 8
96: 5 + (2 + 9) + 8
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99: 5 + (2 + (9 + 8))
100: 5 + 2 +(9 + 8)
101: (5 + 2) + (9 + 8)
102: 5 + 8 + 2 + 9
103: (5 + 8) + 2 + 9
104: (5 + 8 + 2) + 9
105: ((5 + 8) + 2) + 9
106: (5 + (8 + 2)) + 9
107: 5 + (8 + 2) + 9
108: 5 + (8 + 2 + 9)
109: 5 + ((8 + 2) + 9)
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112: (5 + 8) + (2 + 9)
113: 5 + 8 + 9 + 2
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131: 5 + ((9 + 2) + 8)
132: 5 + (9 + (2 + 8))
133: 5 + 9 +(2 + 8)
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135: (5 - 9) × (2 - 8)
136: 5 + 9 + 8 + 2
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144: 5 + (9 + (8 + 2))
145: 5 + 9 +(8 + 2)
146: (5 + 9) + (8 + 2)
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148: (8 + 2) + 5 + 9
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151: (8 + (2 + 5)) + 9
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154: 8 + ((2 + 5) + 9)
155: 8 + (2 + (5 + 9))
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178: 8 + (5 + (2 + 9))
179: 8 + 5 +(2 + 9)
180: (8 + 5) + (2 + 9)
181: (8 ÷ (5 - 2)) × 9
182: 8 ÷ (5 - 2) × 9
183: 8 ÷ ((5 - 2) ÷ 9)
184: 8 + 5 + 9 + 2
185: (8 + 5) + 9 + 2
186: (8 + 5 + 9) + 2
187: ((8 + 5) + 9) + 2
188: (8 + (5 + 9)) + 2
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194: (8 + 5) + (9 + 2)
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216: 8 + ((9 + 5) + 2)
217: 8 + (9 + (5 + 2))
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219: (8 + 9) + (5 + 2)
220: (8 + 9 - 5) × 2
221: ((8 + 9) - 5) × 2
222: (8 + (9 - 5)) × 2
223: 8 × (9 ÷ (5 - 2))
224: 8 × 9 ÷(5 - 2)
225: (8 × 9) ÷ (5 - 2)
226: 9 + 2 + 5 + 8
227: (9 + 2) + 5 + 8
228: (9 + 2 + 5) + 8
229: ((9 + 2) + 5) + 8
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259: (9 ÷ (5 - 2)) × 8
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261: 9 ÷ ((5 - 2) ÷ 8)
262: 9 + 5 + 8 + 2
263: (9 + 5) + 8 + 2
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276: (9 - 5) × (8 - 2)
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278: (9 + 8) + 2 + 5
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296: 9 + (8 + (5 + 2))
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298: (9 + 8) + (5 + 2)
299: (9 + 8 - 5) × 2
300: ((9 + 8) - 5) × 2
301: (9 + (8 - 5)) × 2
302: 9 × (8 ÷ (5 - 2))
303: 9 × 8 ÷(5 - 2)
304: (9 × 8) ÷ (5 - 2)
2: (2 + 5) + 8 + 9
3: (2 + 5 + 8) + 9
4: ((2 + 5) + 8) + 9
5: (2 + (5 + 8)) + 9
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299: (9 + 8 - 5) × 2
300: ((9 + 8) - 5) × 2
301: (9 + (8 - 5)) × 2
302: 9 × (8 ÷ (5 - 2))
303: 9 × 8 ÷(5 - 2)
304: (9 × 8) ÷ (5 - 2)
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2+5+8+9=24
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2 + 5 + 8 + 9
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