1樓：
1: 2 + 3 × 5 + 7
2: (2 + 3 × 5) + 7
3: (2 + (3 × 5)) + 74: 2 + (3 × 5) + 7
5: 2 + (3 × 5 + 7)
6: 2 + ((3 × 5) + 7)7: 2 + 5 × 3 + 7
8: (2 + 5 × 3) + 7
9: (2 + (5 × 3)) + 710: 2 + (5 × 3) + 7
11: 2 + (5 × 3 + 7)
12: 2 + ((5 × 3) + 7)13: 2 + 7 + 3 × 5
14: (2 + 7) + 3 × 5
15: 2 + (7 + 3 × 5)
16: 2 + (7 + (3 × 5))17: 2 + 7 +(3 × 5)
18: (2 + 7) + (3 × 5)19: 2 + 7 + 5 × 3
20: (2 + 7) + 5 × 3
21: 2 + (7 + 5 × 3)
22: 2 + (7 + (5 × 3))23: 2 + 7 +(5 × 3)
24: (2 + 7) + (5 × 3)25: 3 - (2 - 5) × 7
26: 3 - ((2 - 5) × 7)27: 3 + (5 - 2) × 7
28: 3 + ((5 - 2) × 7)29: 3 × 5 + 2 + 7
30: (3 × 5) + 2 + 7
31: (3 × 5 + 2) + 7
32: ((3 × 5) + 2) + 733: 3 × 5 +(2 + 7)
34: (3 × 5) + (2 + 7)35: 3 × 5 + 7 + 2
36: (3 × 5) + 7 + 2
37: (3 × 5 + 7) + 2
38: ((3 × 5) + 7) + 239: 3 × 5 +(7 + 2)
40: (3 × 5) + (7 + 2)41: 3 - (7 × (2 - 5))42: 3 - 7 ×(2 - 5)
43: 3 × 7 - 2 + 5
44: (3 × 7) - 2 + 5
45: (3 × 7 - 2) + 5
46: ((3 × 7) - 2) + 547: 3 × 7 -(2 - 5)
48: (3 × 7) - (2 - 5)49: 3 + (7 × (5 - 2))50: 3 + 7 ×(5 - 2)
51: 3 × 7 + 5 - 2
52: (3 × 7) + 5 - 2
53: (3 × 7 + 5) - 2
54: ((3 × 7) + 5) - 255: 3 × 7 +(5 - 2)
56: (3 × 7) + (5 - 2)57: 5 - 2 + 3 × 7
58: (5 - 2) + 3 × 7
59: 5 - 2 +(3 × 7)
60: (5 - 2) + (3 × 7)61: 5 - (2 - 3 × 7)
62: 5 - (2 - (3 × 7))63: 5 - 2 + 7 × 3
64: (5 - 2) + 7 × 3
65: 5 - 2 +(7 × 3)
66: (5 - 2) + (7 × 3)67: 5 - (2 - 7 × 3)
68: 5 - (2 - (7 × 3))69: (5 - 2) × 7 + 3
70: ((5 - 2) × 7) + 371: 5 × 3 + 2 + 7
72: (5 × 3) + 2 + 7
73: (5 × 3 + 2) + 7
74: ((5 × 3) + 2) + 775: 5 × 3 +(2 + 7)
76: (5 × 3) + (2 + 7)77: 5 + 3 × 7 - 2
78: (5 + 3 × 7) - 2
79: (5 + (3 × 7)) - 280: 5 + (3 × 7) - 2
81: 5 + (3 × 7 - 2)
82: 5 + ((3 × 7) - 2)83: 5 × 3 + 7 + 2
84: (5 × 3) + 7 + 2
85: (5 × 3 + 7) + 2
86: ((5 × 3) + 7) + 287: 5 × 3 +(7 + 2)
88: (5 × 3) + (7 + 2)89: 5 + 7 × 3 - 2
90: (5 + 7 × 3) - 2
91: (5 + (7 × 3)) - 292: 5 + (7 × 3) - 2
93: 5 + (7 × 3 - 2)
94: 5 + ((7 × 3) - 2)95: 7 + 2 + 3 × 5
96: (7 + 2) + 3 × 5
97: 7 + (2 + 3 × 5)
98: 7 + (2 + (3 × 5))99: 7 + 2 +(3 × 5)
100: (7 + 2) + (3 × 5)101: 7 + 2 + 5 × 3
102: (7 + 2) + 5 × 3103: 7 + (2 + 5 × 3)104: 7 + (2 + (5 × 3))105: 7 + 2 +(5 × 3)
106: (7 + 2) + (5 × 3)107: 7 × 3 - 2 + 5
108: (7 × 3) - 2 + 5109: (7 × 3 - 2) + 5110: ((7 × 3) - 2) + 5111: 7 × 3 -(2 - 5)
112: (7 × 3) - (2 - 5)113: 7 + 3 × 5 + 2
114: (7 + 3 × 5) + 2115: (7 + (3 × 5)) + 2116:
7 + (3 × 5) + 2117: 7 + (3 × 5 + 2)118: 7 + ((3 × 5) + 2)119:
7 × 3 + 5 - 2
120: (7 × 3) + 5 - 2121: (7 × 3 + 5) - 2122: ((7 × 3) + 5) - 2123: 7 × 3 +(5 - 2)
124: (7 × 3) + (5 - 2)125: (7 × (5 - 2)) + 3126: 7 × (5 - 2) + 3127: 7 + 5 × 3 + 2
128: (7 + 5 × 3) + 2129: (7 + (5 × 3)) + 2130:
7 + (5 × 3) + 2131: 7 + (5 × 3 + 2)132: 7 + ((5 × 3) + 2)1:
8 + 4 + 5 + 7
2: (8 + 4) + 5 + 7
3: (8 + 4 + 5) + 7
4: ((8 + 4) + 5) + 75: (8 + (4 + 5)) + 76: 8 + (4 + 5) + 7
7: 8 + (4 + 5 + 7)
8: 8 + ((4 + 5) + 7)9: 8 + (4 + (5 + 7))10: 8 + 4 +(5 + 7)
11: (8 + 4) + (5 + 7)12: 8 ÷ 4 ×(5 + 7)
13: (8 ÷ 4) × (5 + 7)14: 8 ÷ (4 ÷ (5 + 7))15: 8 + 4 + 7 + 5
16: (8 + 4) + 7 + 5
17: (8 + 4 + 7) + 5
18: ((8 + 4) + 7) + 519: (8 + (4 + 7)) + 520: 8 + (4 + 7) + 5
21: 8 + (4 + 7 + 5)
22: 8 + ((4 + 7) + 5)23: 8 + (4 + (7 + 5))24: 8 + 4 +(7 + 5)
25: (8 + 4) + (7 + 5)26: (8 + 4) × (7 - 5)27: 8 ÷ 4 ×(7 + 5)
28: (8 ÷ 4) × (7 + 5)29: 8 ÷ (4 ÷ (7 + 5))30: 8 + 5 + 4 + 7
31: (8 + 5) + 4 + 7
32: (8 + 5 + 4) + 7
33: ((8 + 5) + 4) + 734: (8 + (5 + 4)) + 735: 8 + (5 + 4) + 7
36: 8 + (5 + 4 + 7)
37: 8 + ((5 + 4) + 7)38: 8 + (5 + (4 + 7))39: 8 + 5 +(4 + 7)
40: (8 + 5) + (4 + 7)41: 8 + 5 + 7 + 4
42: (8 + 5) + 7 + 4
43: (8 + 5 + 7) + 4
44: ((8 + 5) + 7) + 445: (8 + (5 + 7)) + 446: 8 + (5 + 7) + 4
47: 8 + (5 + 7 + 4)
48: 8 + ((5 + 7) + 4)49: 8 + (5 + (7 + 4))50: 8 + 5 +(7 + 4)
51: (8 + 5) + (7 + 4)52: (8 + 5 - 7) × 4
53: ((8 + 5) - 7) × 454: (8 + (5 - 7)) × 455: (8 × (5 + 7)) ÷ 456: 8 × (5 + 7) ÷ 4
57: 8 × ((5 + 7) ÷ 4)58: 8 + 7 + 4 + 5
59: (8 + 7) + 4 + 5
60: (8 + 7 + 4) + 5
61: ((8 + 7) + 4) + 562: (8 + (7 + 4)) + 563: 8 + (7 + 4) + 5
64: 8 + (7 + 4 + 5)
65: 8 + ((7 + 4) + 5)66: 8 + (7 + (4 + 5))67: 8 + 7 +(4 + 5)
68: (8 + 7) + (4 + 5)69: 8 + 7 + 5 + 4
70: (8 + 7) + 5 + 4
71: (8 + 7 + 5) + 4
72: ((8 + 7) + 5) + 473: (8 + (7 + 5)) + 474: 8 + (7 + 5) + 4
75: 8 + (7 + 5 + 4)
76: 8 + ((7 + 5) + 4)77: 8 + (7 + (5 + 4))78: 8 + 7 +(5 + 4)
79: (8 + 7) + (5 + 4)80: (8 - 7 + 5) × 4
81: ((8 - 7) + 5) × 482: (8 - (7 - 5)) × 483: (8 × (7 + 5)) ÷ 484: 8 × (7 + 5) ÷ 4
85: 8 × ((7 + 5) ÷ 4)86: 4 + 8 + 5 + 7
87: (4 + 8) + 5 + 7
88: (4 + 8 + 5) + 7
89: ((4 + 8) + 5) + 790: (4 + (8 + 5)) + 791: 4 + (8 + 5) + 7
92: 4 + (8 + 5 + 7)
93: 4 + ((8 + 5) + 7)94: 4 + (8 + (5 + 7))95: 4 + 8 +(5 + 7)
96: (4 + 8) + (5 + 7)97: 4 × (8 + 5 - 7)
98: 4 × ((8 + 5) - 7)99: 4 × (8 + (5 - 7))100: 4 + 8 + 7 + 5
101: (4 + 8) + 7 + 5102: (4 + 8 + 7) + 5103:
((4 + 8) + 7) + 5104: (4 + (8 + 7)) + 5105: 4 + (8 + 7) + 5106:
4 + (8 + 7 + 5)107: 4 + ((8 + 7) + 5)108: 4 + (8 + (7 + 5))109:
4 + 8 +(7 + 5)
110: (4 + 8) + (7 + 5)111: (4 + 8) × (7 - 5)112:
4 × (8 - 7 + 5)113: 4 × ((8 - 7) + 5)114: 4 × (8 - (7 - 5))115:
4 + 5 + 8 + 7
116: (4 + 5) + 8 + 7117: (4 + 5 + 8) + 7118:
((4 + 5) + 8) + 7119: (4 + (5 + 8)) + 7120: 4 + (5 + 8) + 7121:
4 + (5 + 8 + 7)122: 4 + ((5 + 8) + 7)123: 4 + (5 + (8 + 7))124:
4 + 5 +(8 + 7)
125: (4 + 5) + (8 + 7)126: 4 × (5 + 8 - 7)127:
4 × ((5 + 8) - 7)128: 4 × (5 + (8 - 7))129: 4 + 5 + 7 + 8
130: (4 + 5) + 7 + 8131: (4 + 5 + 7) + 8132:
((4 + 5) + 7) + 8133: (4 + (5 + 7)) + 8134: 4 + (5 + 7) + 8135:
4 + (5 + 7 + 8)136: 4 + ((5 + 7) + 8)137: 4 + (5 + (7 + 8))138:
4 + 5 +(7 + 8)
139: (4 + 5) + (7 + 8)140: 4 × (5 - 7 + 8)141:
4 × ((5 - 7) + 8)142: 4 × (5 - (7 - 8))143: 4 + 7 + 8 + 5
144: (4 + 7) + 8 + 5145: (4 + 7 + 8) + 5146:
((4 + 7) + 8) + 5147: (4 + (7 + 8)) + 5148: 4 + (7 + 8) + 5149:
4 + (7 + 8 + 5)150: 4 + ((7 + 8) + 5)151: 4 + (7 + (8 + 5))152:
4 + 7 +(8 + 5)
153: (4 + 7) + (8 + 5)154: 4 + 7 + 5 + 8
155: (4 + 7) + 5 + 8156: (4 + 7 + 5) + 8157:
((4 + 7) + 5) + 8158: (4 + (7 + 5)) + 8159: 4 + (7 + 5) + 8160:
4 + (7 + 5 + 8)161: 4 + ((7 + 5) + 8)162: 4 + (7 + (5 + 8))163:
4 + 7 +(5 + 8)
164: (4 + 7) + (5 + 8)165: 5 + 8 + 4 + 7
166: (5 + 8) + 4 + 7167: (5 + 8 + 4) + 7168:
((5 + 8) + 4) + 7169: (5 + (8 + 4)) + 7170: 5 + (8 + 4) + 7171:
5 + (8 + 4 + 7)172: 5 + ((8 + 4) + 7)173: 5 + (8 + (4 + 7))174:
5 + 8 +(4 + 7)
175: (5 + 8) + (4 + 7)176: 5 + 8 + 7 + 4
177: (5 + 8) + 7 + 4178: (5 + 8 + 7) + 4179:
((5 + 8) + 7) + 4180: (5 + (8 + 7)) + 4181: 5 + (8 + 7) + 4182:
5 + (8 + 7 + 4)183: 5 + ((8 + 7) + 4)184: 5 + (8 + (7 + 4))185:
5 + 8 +(7 + 4)
186: (5 + 8) + (7 + 4)187: (5 + 8 - 7) × 4188:
((5 + 8) - 7) × 4189: (5 + (8 - 7)) × 4190: 5 + 4 + 8 + 7
191: (5 + 4) + 8 + 7192: (5 + 4 + 8) + 7193:
((5 + 4) + 8) + 7194: (5 + (4 + 8)) + 7195: 5 + (4 + 8) + 7196:
5 + (4 + 8 + 7)197: 5 + ((4 + 8) + 7)198: 5 + (4 + (8 + 7))199:
5 + 4 +(8 + 7)
200: (5 + 4) + (8 + 7)201: 5 + 4 + 7 + 8
202: (5 + 4) + 7 + 8203: (5 + 4 + 7) + 8204:
((5 + 4) + 7) + 8205: (5 + (4 + 7)) + 8206: 5 + (4 + 7) + 8207:
5 + (4 + 7 + 8)208: 5 + ((4 + 7) + 8)209: 5 + (4 + (7 + 8))210:
5 + 4 +(7 + 8)
211: (5 + 4) + (7 + 8)212: 5 + 7 + 8 + 4
213: (5 + 7) + 8 + 4214: (5 + 7 + 8) + 4215:
((5 + 7) + 8) + 4216: (5 + (7 + 8)) + 4217: 5 + (7 + 8) + 4218:
5 + (7 + 8 + 4)219: 5 + ((7 + 8) + 4)220: 5 + (7 + (8 + 4))221:
5 + 7 +(8 + 4)
222: (5 + 7) + (8 + 4)223: (5 + 7) × 8 ÷ 4224:
((5 + 7) × 8) ÷ 4225: (5 + 7) × (8 ÷ 4)226: (5 - 7 + 8) × 4227:
((5 - 7) + 8) × 4228: (5 - (7 - 8)) × 4229: 5 + 7 + 4 + 8
230: (5 + 7) + 4 + 8231: (5 + 7 + 4) + 8232:
((5 + 7) + 4) + 8233: (5 + (7 + 4)) + 8234: 5 + (7 + 4) + 8235:
5 + (7 + 4 + 8)236: 5 + ((7 + 4) + 8)237: 5 + (7 + (4 + 8))238:
5 + 7 +(4 + 8)
239: (5 + 7) + (4 + 8)240: (5 + 7) ÷ 4 × 8241:
((5 + 7) ÷ 4) × 8242: (5 + 7) ÷ (4 ÷ 8)243: 7 + 8 + 4 + 5
244: (7 + 8) + 4 + 5245: (7 + 8 + 4) + 5246:
((7 + 8) + 4) + 5247: (7 + (8 + 4)) + 5248: 7 + (8 + 4) + 5249:
7 + (8 + 4 + 5)250: 7 + ((8 + 4) + 5)251: 7 + (8 + (4 + 5))252:
7 + 8 +(4 + 5)
253: (7 + 8) + (4 + 5)254: 7 + 8 + 5 + 4
255: (7 + 8) + 5 + 4256: (7 + 8 + 5) + 4257:
((7 + 8) + 5) + 4258: (7 + (8 + 5)) + 4259: 7 + (8 + 5) + 4260:
7 + (8 + 5 + 4)261: 7 + ((8 + 5) + 4)262: 7 + (8 + (5 + 4))263:
7 + 8 +(5 + 4)
264: (7 + 8) + (5 + 4)265: 7 + 4 + 8 + 5
266: (7 + 4) + 8 + 5267: (7 + 4 + 8) + 5268:
((7 + 4) + 8) + 5269: (7 + (4 + 8)) + 5270: 7 + (4 + 8) + 5271:
7 + (4 + 8 + 5)272: 7 + ((4 + 8) + 5)273: 7 + (4 + (8 + 5))274:
7 + 4 +(8 + 5)
275: (7 + 4) + (8 + 5)276: 7 + 4 + 5 + 8
277: (7 + 4) + 5 + 8278: (7 + 4 + 5) + 8279:
((7 + 4) + 5) + 8280: (7 + (4 + 5)) + 8281: 7 + (4 + 5) + 8282:
7 + (4 + 5 + 8)283: 7 + ((4 + 5) + 8)284: 7 + (4 + (5 + 8))285:
7 + 4 +(5 + 8)
286: (7 + 4) + (5 + 8)287: 7 + 5 + 8 + 4
288: (7 + 5) + 8 + 4289: (7 + 5 + 8) + 4290:
((7 + 5) + 8) + 4291: (7 + (5 + 8)) + 4292: 7 + (5 + 8) + 4293:
7 + (5 + 8 + 4)294: 7 + ((5 + 8) + 4)295: 7 + (5 + (8 + 4))296:
7 + 5 +(8 + 4)
297: (7 + 5) + (8 + 4)298: (7 + 5) × 8 ÷ 4299:
((7 + 5) × 8) ÷ 4300: (7 + 5) × (8 ÷ 4)301: (7 - 5) × (8 + 4)302:
7 + 5 + 4 + 8
303: (7 + 5) + 4 + 8304: (7 + 5 + 4) + 8305:
((7 + 5) + 4) + 8306: (7 + (5 + 4)) + 8307: 7 + (5 + 4) + 8308:
7 + (5 + 4 + 8)309: 7 + ((5 + 4) + 8)310: 7 + (5 + (4 + 8))311:
7 + 5 +(4 + 8)
312: (7 + 5) + (4 + 8)313: (7 + 5) ÷ 4 × 8314:
((7 + 5) ÷ 4) × 8315: (7 + 5) ÷ (4 ÷ 8)316: (7 - 5) × (4 + 8)
什麼叫自然數或自然數的定義，什麼叫做自然數，自然數有哪些？ 100
用以計量事物的件數或表示事物次序的數。即用數碼 0，1，2，3，4，所表示的數 有爭議 表示物體個數的數叫自然數，自然數由1 0，有爭議 開始，一個接一個，組成一個無窮的集體。 巨集哥 表示物體個數的數叫自然數.如0,1,2,3,4, 自然數用以計量事物的件數或表示事物次序的數。即用數碼0，1，2，...
自然數有哪些，自然數都有哪些
0 1 2 3 4 5 都是自然數。自然數有無數個。什麼叫做自然數，自然數有哪些？100 自然數用以計量事物的件數或表示事物次序的數。即用數碼0，1，2，3，4，所表示的數。表示物體個數的數叫自然數，自然數由0開始，乙個接乙個，組成乙個無窮的集體。自然數有有序性，無限性。分為偶數和奇數，合數和質數等...
求這樣的自然數,p,q,r,s pqrs ,使得下列等式成立 1 s1求數，c語言
你每個迴圈需要設下跳出條件的，還有1 p不能這麼寫，這樣結果肯定是0，因為是整數相除，要寫1.0 p才能是小數結果是 2，3，9，18 2，3，12，12 2，4，5，20 2，4，6，12 2，4，8，8 3，3，4，12 4，4，4，4 對吧。程式如下 include void main inc...