Question

用+.-.X./怎样使以下算式成立：1 2 3 4 5 6 7=51

Answer 1

1 :1 + 2 + 3 - 4 + 56 - 7 = 51

2 :1 + 2 - 3 + 4 + 5 + 6 * 7 = 51

3 :1 + 2 * 3 + 45 + 6 - 7 = 51

4 :1 + 2 * 34 - 5 - 6 - 7 = 51

5 :1 + 23 + 4 + 5 * 6 - 7 = 51

6 :1 - 2 + 34 + 5 + 6 + 7 = 51

7 :1 * 2 + 3 + 45 - 6 + 7 = 51

8 :1 * 2 + 3 * 4 + 5 * 6 + 7 = 51

9 :1 * 2 + 3 * 4 - 5 + 6 * 7 = 51

10 :1 * 2 + 3 / 4 * 56 + 7 = 51

11 :1 * 2 * 3 - 4 + 56 - 7 = 51

12 :1 / 2 + 345 / 6 - 7 = 51

13 :12 * 34 / 56 * 7 = 51

14 :12 / 3 - 4 * 5 + 67 = 51

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1 :-1 + 2 + 3 - 4 * 5 + 67 = 51

2 :-1 + 2 - 3 + 4 + 56 - 7 = 51

3 :-1 + 2 - 3 * 4 - 5 + 67 = 51

4 :-1 + 2 * 3 + 45 - 6 + 7 = 51

5 :-1 + 2 * 3 * 45 / 6 + 7 = 51

6 :-1 + 2 * 3 / 4 * 5 * 6 + 7 = 51

7 :-1 - 2 + 3 + 4 + 5 + 6 * 7 = 51

8 :-1 - 2 * 3 + 45 + 6 + 7 = 51

9 :-1 - 2 * 3 - 4 - 5 + 67 = 51

10 :-1 / 2 * 3 + 45 / 6 * 7 = 51

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