题目内容
(2012?资中县模拟)
灵活计算下面各题.
|
(
|
| ||||||||||||||||||||
20÷[1-(
|
[2-(1
|
540÷12×9+482. |
分析:算式(1)(4)(5)(6)根据四则混合运算的运算顺序计算即可;
算式(2)(3)可根据乘法分配律进行计算.
算式(2)(3)可根据乘法分配律进行计算.
解答:解:(1)
÷
+
×
,
=
+
,
=
;
(2)(
-
+
)×24,
=
×24-
×24+
×24,
=20-6+10,
=24;
(3)
×1
+1.25×
+125%,
=
×1.25+1.25×
+1.25,
=(
+
+1)×1.25,
=2×1.25,
=2.5;
(4)20÷[1-(
+
)],
=20÷[1-
],
=20÷
,
=48;
(5)[2-(1
-1.5)÷1
]×6
,
=[2-(
-
)×
]×
,
=[2-
×
]×
,
=[2-
]×
,
=
×
,
=12;
(6)540÷12×9+482
=45×9+482,
=405+482,
=887.
| 7 |
| 10 |
| 1 |
| 5 |
| 3 |
| 8 |
| 2 |
| 3 |
=
| 7 |
| 2 |
| 1 |
| 4 |
=
| 15 |
| 4 |
(2)(
| 5 |
| 6 |
| 1 |
| 4 |
| 5 |
| 12 |
=
| 5 |
| 6 |
| 1 |
| 4 |
| 5 |
| 12 |
=20-6+10,
=24;
(3)
| 3 |
| 8 |
| 1 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 8 |
| 5 |
| 8 |
=(
| 3 |
| 8 |
| 5 |
| 8 |
=2×1.25,
=2.5;
(4)20÷[1-(
| 1 |
| 4 |
| 1 |
| 3 |
=20÷[1-
| 7 |
| 12 |
=20÷
| 5 |
| 12 |
=48;
(5)[2-(1
| 2 |
| 3 |
| 5 |
| 12 |
| 3 |
| 8 |
=[2-(
| 5 |
| 3 |
| 3 |
| 2 |
| 12 |
| 17 |
| 51 |
| 8 |
=[2-
| 1 |
| 6 |
| 12 |
| 17 |
| 51 |
| 8 |
=[2-
| 2 |
| 17 |
| 51 |
| 8 |
=
| 32 |
| 17 |
| 51 |
| 8 |
=12;
(6)540÷12×9+482
=45×9+482,
=405+482,
=887.
点评:完成本题要注意分析式中数据的特点及内在联系,然后运用合适的方法进行计算.
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