题目内容
能简算的要简算.
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| ||||||||||
[1-(
|
|
分析:(1)(3)依据四则运算计算方法:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(2)(4)运用乘法分配律解答.
(2)(4)运用乘法分配律解答.
解答:解:(1)
÷(
+
),
=
÷
,
=
;
(2)
×7+
×11,
=(7+11)×
,
=18×
,
=10;
(3)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=1
;
(4)
×99+
,
=(1+99)×
,
=100×
,
=16.
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 3 |
=
| 4 |
| 9 |
| 2 |
| 3 |
=
| 2 |
| 3 |
(2)
| 5 |
| 9 |
| 5 |
| 9 |
=(7+11)×
| 5 |
| 9 |
=18×
| 5 |
| 9 |
=10;
(3)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=1
| 1 |
| 2 |
(4)
| 4 |
| 25 |
| 4 |
| 25 |
=(1+99)×
| 4 |
| 25 |
=100×
| 4 |
| 25 |
=16.
点评:本题主要考查学生正确运用四则运算计算方法,以及运用乘法分配律解决问题的能力.
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