题目内容
1
÷[2
-
×(1.7+1
)]×0.16.
| 7 |
| 10 |
| 1 |
| 3 |
| 12 |
| 29 |
| 1 |
| 5 |
分析:先算小括号里的加法,再算中括号里面的乘法,然后算中括号里面的减法,再算括号外的除法,最后算括号外的乘法.
解答:解:1
÷[2
-
×(1.7+1
)]×0.16,
=1
÷[2
-
×
]×0.16,
=1
÷[2
-1
]×0.16,
=1
÷
×0.16,
=
×
×
,
=
×
,
=
.
| 7 |
| 10 |
| 1 |
| 3 |
| 12 |
| 29 |
| 1 |
| 5 |
=1
| 7 |
| 10 |
| 1 |
| 3 |
| 12 |
| 29 |
| 29 |
| 10 |
=1
| 7 |
| 10 |
| 1 |
| 3 |
| 1 |
| 5 |
=1
| 7 |
| 10 |
| 17 |
| 15 |
=
| 17 |
| 10 |
| 15 |
| 17 |
| 4 |
| 25 |
=
| 15 |
| 10 |
| 4 |
| 25 |
=
| 6 |
| 25 |
点评:1.一个算式里,如果含有两级运算,要先做第二级运算,后做第一级运算.
2.一个算式里,如果有括号,要先算小括号里的,再算中括号里面的.
2.一个算式里,如果有括号,要先算小括号里的,再算中括号里面的.
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