题目内容
3.5-1
+
.
| 2 |
| 3 |
| 1 |
| 6 |
分析:先将式中的小数化为分数后,再根据分数加减法的计算法则完成即可.
解答:解:3.5-1
+
,
=
-
+
,
=
-
+
,
=
+
,
=
,
=2.
| 2 |
| 3 |
| 1 |
| 6 |
=
| 7 |
| 2 |
| 5 |
| 3 |
| 1 |
| 6 |
=
| 63 |
| 18 |
| 30 |
| 18 |
| 3 |
| 18 |
=
| 33 |
| 18 |
| 3 |
| 18 |
=
| 36 |
| 18 |
=2.
点评:完成本题的关健是要注意通分约分.
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