题目内容
9
÷1
+2.4÷1
.
| 3 |
| 5 |
| 1 |
| 3 |
| 1 |
| 3 |
9
÷1
+2.4÷1
=9
×
+2.4×
,
=(9
+2.4)×
,
=12×
,
=9.
| 3 |
| 5 |
| 1 |
| 3 |
| 1 |
| 3 |
=9
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
=(9
| 3 |
| 5 |
| 3 |
| 4 |
=12×
| 3 |
| 4 |
=9.
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