问题
解答题
|
答案
（1）12-
| 2 |
| 7 |
| 1 |
| 7 |
| 1 |
| 5 |
=12-
| 2 |
| 7 |
| 1 |
| 7 |
=12+（
| 5 |
| 7 |
| 2 |
| 7 |
=12+
| 3 |
| 7 |
=12
| 3 |
| 7 |
（2）76×
| 76 |
| 77 |
=（77-1）×
| 76 |
| 77 |
=77×
| 76 |
| 77 |
| 76 |
| 77 |
=76-
| 76 |
| 77 |
=75
| 1 |
| 77 |
（3）（
| 2 |
| 5 |
| 6 |
| 7 |
=
| 2 |
| 5 |
| 6 |
| 7 |
=14+30，
=44；
（4）
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 7 |
=
| 5 |
| 12 |
| 1 |
| 7 |
| 7 |
| 12 |
| 1 |
| 7 |
=（
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |