题目内容
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 15 |
| 5 |
| 6 |
分析:同时运算乘法,再算减法.
解答:解:
×
-
×
,
=
-
,
=
.
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 15 |
| 5 |
| 6 |
=
| 2 |
| 3 |
| 7 |
| 18 |
=
| 5 |
| 18 |
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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题目内容
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 15 |
| 5 |
| 6 |
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 15 |
| 5 |
| 6 |
| 2 |
| 3 |
| 7 |
| 18 |
| 5 |
| 18 |