题目内容
[
×(
-0.25)+
]÷
.
| 4 |
| 7 |
| 3 |
| 5 |
| 3 |
| 10 |
| 1 |
| 2 |
分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:[
×(
-0.25)+
]÷
=[
×(
-
)+
]÷
,
=[
×
+
]×2,
=[
+
]×2,
=
×2,
=1.
| 4 |
| 7 |
| 3 |
| 5 |
| 3 |
| 10 |
| 1 |
| 2 |
=[
| 4 |
| 7 |
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 10 |
| 1 |
| 2 |
=[
| 4 |
| 7 |
| 7 |
| 20 |
| 3 |
| 10 |
=[
| 2 |
| 10 |
| 3 |
| 10 |
=
| 1 |
| 2 |
=1.
点评:当算式中同时含有中括号与小括号时,要先算中括号里面的再算小括号里面的.
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