题目内容
计算下面各题，怎样计算简便就怎样计算．
×
÷
+（
+
）×
÷7+
×
．
| 8 |
| 9 |
| 2 |
| 5 |
| 8 |
| 15 |
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 2 |
| 7 |
| 25 |
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（1）
×
÷
，
=
×
×
，
=
×
×
，
=
×
，
=
；
（2）
+（
+
）×
，
=
+
×
，
=
+
，
=
；
（3）
÷7+
×
，
=
×
+
×
，
=（
+
）×
，
=1×
，
=
．
| 8 |
| 9 |
| 2 |
| 5 |
| 8 |
| 15 |
=
| 8 |
| 9 |
| 2 |
| 5 |
| 15 |
| 8 |
=
| 8 |
| 9 |
| 15 |
| 8 |
| 2 |
| 5 |
=
| 5 |
| 3 |
| 2 |
| 5 |
=
| 2 |
| 3 |
（2）
| 2 |
| 3 |
| 4 |
| 7 |
| 1 |
| 2 |
| 7 |
| 25 |
=
| 2 |
| 3 |
| 15 |
| 14 |
| 7 |
| 25 |
=
| 2 |
| 3 |
| 3 |
| 10 |
=
| 29 |
| 30 |
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
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