题目内容
[7-(1
×
+1
×
)]÷1.75.
| 3 |
| 4 |
| 5 |
| 9 |
| 3 |
| 4 |
| 4 |
| 9 |
分析:本题可根据乘法分配律对小括号中的算式进行简便计算.
解答:解:[7-(1
×
+1
×
)]÷1.75
=[7-(
+
)×1
]÷1.75,
=[7-1×1
]÷1.75,
=[7-1
]÷1.75,
=5.25÷1.75,
=3.
| 3 |
| 4 |
| 5 |
| 9 |
| 3 |
| 4 |
| 4 |
| 9 |
=[7-(
| 5 |
| 9 |
| 4 |
| 9 |
| 3 |
| 4 |
=[7-1×1
| 3 |
| 4 |
=[7-1
| 3 |
| 4 |
=5.25÷1.75,
=3.
点评:当算式中同时含有小括号与中括号时,要注意先算小括号里面的,再算中括号里面的.
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