题目内容
计算下面各题，能简算的要简算．
|
|
|
|
（1）
÷7+
×
，
=
×
+
×
，
=
×（
+
），
=
×
，
=
；
（2）
÷[（
+
）÷
]，
=
÷[（
+
）×
]，
=
÷[
×
+
×
]，
=
÷[1+
]，
=
×
，
=
；
（3）
÷7×
÷
，
=
×
×
×
，
=
×
×
，
=
×
，
=
；
（4）
-（
+2×
），
=
-（
+
），
=
-
，
=
．
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 1 |
| 7 |
| 8 |
| 13 |
| 6 |
| 13 |
=
| 1 |
| 7 |
| 14 |
| 13 |
=
| 2 |
| 13 |
（2）
| 11 |
| 13 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
=
| 11 |
| 13 |
| 5 |
| 8 |
| 3 |
| 4 |
| 8 |
| 5 |
=
| 11 |
| 13 |
| 5 |
| 8 |
| 8 |
| 5 |
| 3 |
| 4 |
| 8 |
| 5 |
=
| 11 |
| 13 |
| 6 |
| 5 |
=
| 11 |
| 13 |
| 5 |
| 11 |
=
| 5 |
| 13 |
（3）
| 35 |
| 36 |
| 4 |
| 15 |
| 3 |
| 5 |
=
| 35 |
| 36 |
| 1 |
| 7 |
| 4 |
| 15 |
| 5 |
| 3 |
=
| 5 |
| 36 |
| 4 |
| 15 |
| 5 |
| 3 |
=
| 1 |
| 27 |
| 5 |
| 3 |
=
| 5 |
| 81 |
（4）
| 19 |
| 20 |
| 3 |
| 5 |
| 1 |
| 8 |
=
| 19 |
| 20 |
| 3 |
| 5 |
| 1 |
| 4 |
=
| 19 |
| 20 |
| 17 |
| 20 |
=
| 1 |
| 10 |
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