题目内容
先判断，再改正
÷
+
÷
=
×
+
×
=（
+
）×
=
______．
| 3 |
| 7 |
| 3 |
| 4 |
| 4 |
| 7 |
| 3 |
| 4 |
=
| 3 |
| 7 |
| 3 |
| 4 |
| 4 |
| 7 |
| 3 |
| 4 |
=（
| 3 |
| 7 |
| 4 |
| 7 |
| 3 |
| 4 |
=
| 3 |
| 4 |
×；
改正：
÷
+
÷
=
×
+
×
，
=（
+
）×
，
=1×
，
=
．
改正：
| 3 |
| 7 |
| 3 |
| 4 |
| 4 |
| 7 |
| 3 |
| 4 |
=
| 3 |
| 7 |
| 4 |
| 3 |
| 4 |
| 7 |
| 4 |
| 3 |
=（
| 3 |
| 7 |
| 4 |
| 7 |
| 4 |
| 3 |
=1×
| 4 |
| 3 |
=
| 4 |
| 3 |
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