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 |
×
×
．分析：根据题意，除以
，等于乘
的倒数，即乘
，原题是错误的，然后再根据乘法分配律进行改正．
| 3 |
| 4 |
| 3 |
| 4 |
| 4 |
| 3 |
解答：解：×；
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 |
点评：完成本题要注意分析式中数据，运用合适的简便方法计算．
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