题目内容
(
|
|
|
分析:(1)先算小括号里的运算,再算括号外的除法;
(2)把除以
化成乘以9,再运用乘法的分配律进行简算;
(3)先算小括号里的加法,再算中括号里的乘法,最后算括号外的除法.
(2)把除以
| 1 |
| 9 |
(3)先算小括号里的加法,再算中括号里的乘法,最后算括号外的除法.
解答:解:(1)(
+
)÷(
-
)
=
÷
=2
(2)
×23-
÷
=
×23-
×9
=
×(23-9)
=
×14
=3
(3)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=
| 1 |
| 6 |
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
=
| 5 |
| 6 |
| 5 |
| 12 |
=2
(2)
| 3 |
| 14 |
| 3 |
| 14 |
| 1 |
| 9 |
=
| 3 |
| 14 |
| 3 |
| 14 |
=
| 3 |
| 14 |
=
| 3 |
| 14 |
=3
(3)
| 6 |
| 7 |
| 1 |
| 3 |
| 1 |
| 2 |
| 3 |
| 7 |
=
| 6 |
| 7 |
| 5 |
| 6 |
| 3 |
| 7 |
=
| 6 |
| 7 |
| 5 |
| 14 |
=
| 12 |
| 5 |
点评:考查了整数、分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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