题目内容
用简便方法计算．
7-
-
÷
×
+
×
．
7-
| 3 |
| 7 |
| 1 |
| 7 |
| 1 |
| 4 |
| 4 |
| 9 |
| 11 |
| 5 |
| 1 |
| 9 |
| 11 |
| 5 |
（1）7-
-
÷
=7-
-
，
=7-（
+
），
=7-1，
=6；
（2）
×
+
×
=（
+
）×
，
=
×
，
=
．
| 3 |
| 7 |
| 1 |
| 7 |
| 1 |
| 4 |
=7-
| 3 |
| 7 |
| 4 |
| 7 |
=7-（
| 3 |
| 7 |
| 4 |
| 7 |
=7-1，
=6；
（2）
| 4 |
| 9 |
| 11 |
| 5 |
| 1 |
| 9 |
| 11 |
| 5 |
=（
| 4 |
| 9 |
| 1 |
| 9 |
| 11 |
| 5 |
=
| 5 |
| 9 |
| 11 |
| 5 |
=
| 11 |
| 9 |
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