请大家帮忙算几题24,加减乘除加括号都可以

2,7,8,10; 4,5,7,10; 3,4,7,8; 2,4,7,7;
5,6,7,9; 2,2,3,10; 2,2,7,9 从别的地方看来的,大家帮算一下

第1个回答  2007-11-15
2,7,8,10算不出来
2, 2, 7, 9

4, 5, 7, 10的24点答案:
1: 4 - (5 - 7) × 10
2: 4 - ((5 - 7) × 10)
3: 4 + (7 - 5) × 10
4: 4 + ((7 - 5) × 10)
5: 4 - (10 × (5 - 7))
6: 4 - 10 ×(5 - 7)
7: 4 + (10 × (7 - 5))
8: 4 + 10 ×(7 - 5)
9: (7 - 5) × 10 + 4
10: ((7 - 5) × 10) + 4
11: (10 × (7 - 5)) + 4
12: 10 × (7 - 5) + 4

3, 4, 7, 8的24点答案:
1: (4 × (7 - 3)) + 8
2: 4 × (7 - 3) + 8
3: (7 - 3) × 4 + 8
4: ((7 - 3) × 4) + 8
5: 8 - (3 - 7) × 4
6: 8 - ((3 - 7) × 4)
7: 8 - (4 × (3 - 7))
8: 8 - 4 ×(3 - 7)
9: 8 + (4 × (7 - 3))
10: 8 + 4 ×(7 - 3)
11: 8 + (7 - 3) × 4
12: 8 + ((7 - 3) × 4)

2, 4, 7, 7的24点答案:
1: (2 × (7 + 7)) - 4
2: 2 × (7 + 7) - 4
3: (7 + 7) × 2 - 4
4: ((7 + 7) × 2) - 4

5, 6, 7, 9的24点答案:
1: 6 - (5 - 7) × 9
2: 6 - ((5 - 7) × 9)
3: 6 + (7 - 5) × 9
4: 6 + ((7 - 5) × 9)
5: 6 - (9 × (5 - 7))
6: 6 - 9 ×(5 - 7)
7: 6 + (9 × (7 - 5))
8: 6 + 9 ×(7 - 5)
9: (7 - 5) × 9 + 6
10: ((7 - 5) × 9) + 6
11: (9 × (7 - 5)) + 6
12: 9 × (7 - 5) + 6

2, 2, 3, 10的24点答案:
1: (2 × (3 + 10)) - 2
2: 2 × (3 + 10) - 2
3: (2 × (10 + 3)) - 2
4: 2 × (10 + 3) - 2
5: (3 + 10) × 2 - 2
6: ((3 + 10) × 2) - 2
7: (10 + 3) × 2 - 2
8: ((10 + 3) × 2) - 2
第2个回答  2007-11-15
2,7,8,10:不可能。

4,5,7,10:4 + ((7 - 5) × 10)或者4 - (10 × (5 - 7))

3,4,7,8:((7 - 3) × 4) + 8或者5: 8 - (4 × (3 - 7))

2,4,7,7:(2 × (7 + 7)) - 4

5,6,7,9:6 - ((5 - 7) × 9)或者6 + (7 - 5) × 9

2,2,3,10: (2 × (3 + 10)) - 2

2,2,7,9:不可能。
第3个回答  2007-11-15
第一道无解。

第二道:(7-5)*10+4

第三道:(7-3)*4+8

第四道:(7+7)*2-4

第五道:(7-5)*9+6

第六道:(10+3)*2-2

第七道无解。
第4个回答  2007-11-15
4+(7-5)*10=24
8+(7-3)*4=24
(7+7)*2-4=24
6+(7-5)*9=24
(3+10)*2-2=24本回答被提问者采纳
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