题干
计算下面各题，得数约成最简分数．
+
=____
+
=____ 1415
+
=____
−
=____
| 3 |
| 8 |
| 3 |
| 8 |
| 7 |
| 1 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
