题目内容
[5
-(0.25+
)×7.2]÷2
.
| 4 |
| 15 |
| 1 |
| 3 |
| 4 |
| 5 |
分析:本题按照先算小括号里的,再算中括号里的,最后算括号外面的运算顺序计算.
解答:解:[5
-(0.25+
)×7.2]÷2
,
=[5
-
×7.2]÷2
,
=[5
-
]÷ 2
,
=
×
,
=
.
| 4 |
| 15 |
| 1 |
| 3 |
| 4 |
| 5 |
=[5
| 4 |
| 15 |
| 7 |
| 12 |
| 4 |
| 5 |
=[5
| 4 |
| 15 |
| 21 |
| 5 |
| 4 |
| 5 |
=
| 16 |
| 15 |
| 5 |
| 14 |
=
| 8 |
| 21 |
点评:本题按照四则混合运算的法则直接运算,注意结果化成最简分数.
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