题目内容
计算:0.625×(1
+3
)+
÷1
-
.
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 6 |
| 3 |
| 5 |
| 5 |
| 8 |
分析:先将本式中的小数化为分数,然后据分配律进行巧算即可.
解答:解:0.625×(1
+3
)+
÷1
-
=
×4
+
×
-
,
=(4
+
-1)×
,
=4×
,
=2
.
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 6 |
| 3 |
| 5 |
| 5 |
| 8 |
=
| 5 |
| 8 |
| 5 |
| 6 |
| 1 |
| 6 |
| 5 |
| 8 |
| 5 |
| 8 |
=(4
| 5 |
| 6 |
| 1 |
| 6 |
| 5 |
| 8 |
=4×
| 5 |
| 8 |
=2
| 1 |
| 2 |
点评:完成本题的关健是先将小数化为分数后找到式中相同的数,然后进行巧算.
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