题干
计算下面各题，得数约成最简分数．
+
=____
+1310
= ____ 2312
−1312
=____
+13
= ____ 14
−
=____
−
=____
| 1 |
| 8 |
| 5 |
| 8 |
| 3 |
| 1 |
| 6 |
| 6 |
| 9 |
| 8 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
