题干
计算下面各题
① 3×
×
| 2 |
| 7 |
| 5 |
②
×
+
×
| 3 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
③ 24×(
+
)
| 1 |
| 8 |
| 1 |
| 6 |
④
÷[
×(
−
)] ．
| 1 |
| 8 |
| 3 |
| 4 |
| 3 |
| 5 |
| 2 |
