题目内容
3
-[4
-（8.5-4×1
）÷0.125]．
| 1 |
| 2 |
| 1 |
| 4 |
| 7 |
| 8 |
3
-[4
-（8.5-4×1
）÷0.125]．
=3
-[4
-（8.5-7.5）÷0.125]，
=3
-[4
-1÷0.125]，
=3
-[4
-8]，
=3
-4
+8，
=3
+8-4
，
=3.5+8-4.25，
=7.25．
| 1 |
| 2 |
| 1 |
| 4 |
| 7 |
| 8 |
=3
| 1 |
| 2 |
| 1 |
| 4 |
=3
| 1 |
| 2 |
| 1 |
| 4 |
=3
| 1 |
| 2 |
| 1 |
| 4 |
=3
| 1 |
| 2 |
| 1 |
| 4 |
=3
| 1 |
| 2 |
| 1 |
| 4 |
=3.5+8-4.25，
=7.25．
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