5 6 奧數問題x3

(5 + 5 - 5 - 5) x 5 = 0
5 - (5 x 5 - 5) ÷ 5 = 1
(5 + 5 + 5 - 5) ÷ 5 = 2
(5 x 5 - 5 - 5) ÷ 5 = 3
(5 + 5 + 5 + 5) ÷ 5 = 4
5 + 5 - 5 x 5 ÷ 5 = 5
5 + 5 - 5 + 5 ÷ 5 = 6
(5 x 5 + 5 + 5) ÷ 5 = 7

1 + 3 + 5 - 9 = 0
(1 + 3 + 5) ÷ 9 = 1
(9 + 3) ÷ (5 + 1) = 2
(5 - 1) x 3 - 9 = 3
(9 - 1) ÷ (5 - 3) = 4
(9 + 1) ÷ 5 + 3 = 5
(9 + 1) ÷ 5 x 3 = 6
(9 + 5) ÷ (3 - 1) = 7
1 + 3 - 5 + 9 = 8
(1 + 5) x 3 - 9 = 9
5 x (9 ÷ 3 - 1) = 10
(1 + 3) x 5 - 9 = 11
(9 - 5) x 3 x 1 = 12
(9 - 5) x 3 + 1 = 13
9 x 5 ÷ 3 - 1 = 14

(60 + 3 x 8 - 4) ÷ 2 = 40
60 + 3 x (8 - 4) ÷ 2 = 66
60 + (3 x 8 - 4) ÷ 2 = 70
(60 + 3) x 8 - 4 + 2 = 502

解答１：

(5-5)*5*5*5 = 0
(5-5)*5+5÷5 = 1
5+5÷5-5 5 = 2
5-5÷5-5÷5 = 3
5+5-5-5÷5 = 4
5+5-5+5-5 = 5
5+5-5+5÷5 = 6
5+5÷5+5÷5 = 7

2013-10-02 23:21:07 補充：
解答２：
9 - 1 - 3 - 5 = 0
1 * 9 - 3 - 5 = 1
1 + 9 - 3 - 5 = 2
5 - 9 ÷ 3 + 1 = 3
(9 - 1) ÷ (5 - 3) = 4
3 * 5 - 9 - 1 = 5
3 * 5 - 9 * 1 = 6
9 ÷ 3 + 5 - 1 = 7
9 ÷ 3 + 5 ÷ 1 = 8
9 ÷ 3 + 5 + 1 = 9
9 + 5 - 3 - 1 = 10
9 + 5 - 3 * 1 = 11
9 + 5 - 3 + 1 = 12
(9 - 5) * 3 + 1 = 13
9 ÷ 3 * 5 - 1 = 14

2013-10-02 23:21:24 補充：
第３題可能要搵彩虹部隊幫你～

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