题目内容
下面各题,怎样简便就怎样算.
×
+
×
×[1÷(
-
)]
×
+
×
.
| 2 |
| 9 |
| 5 |
| 7 |
| 2 |
| 9 |
| 2 |
| 7 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 10 |
| 5 |
| 21 |
| 25 |
| 31 |
| 6 |
| 21 |
| 5 |
| 31 |
(1)
| 2 |
| 9 |
| 5 |
| 7 |
| 2 |
| 9 |
| 2 |
| 7 |
=
| 2 |
| 9 |
| 5 |
| 7 |
| 2 |
| 7 |
=
| 2 |
| 9 |
(2)
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 10 |
=
| 3 |
| 4 |
| 3 |
| 10 |
=
| 3 |
| 4 |
| 10 |
| 3 |
=
| 5 |
| 2 |
(3)
| 5 |
| 21 |
| 25 |
| 31 |
| 6 |
| 21 |
| 5 |
| 31 |
=
| 5 |
| 21 |
| 25 |
| 31 |
| 5 |
| 21 |
| 6 |
| 31 |
=
| 5 |
| 21 |
| 25 |
| 31 |
| 6 |
| 31 |
=
| 5 |
| 21 |
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