题目内容
(2012?泗县模拟)
×
+
×
.
| 4 |
| 7 |
| 2 |
| 3 |
| 1 |
| 3 |
| 3 |
| 7 |
分析:
×
+
×
,同时运算两个乘法,再算加法.
| 4 |
| 7 |
| 2 |
| 3 |
| 1 |
| 3 |
| 3 |
| 7 |
解答:解:
×
+
×
,
=
+
,
=
.
| 4 |
| 7 |
| 2 |
| 3 |
| 1 |
| 3 |
| 3 |
| 7 |
=
| 8 |
| 21 |
| 3 |
| 21 |
=
| 11 |
| 21 |
点评:一个算式里,如果含有两级运算,要先做第二级运算,后做第一级运算.
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