题目内容
| 计算下列各题(能简算的要简算) (
|
| ||||||||||||||
|
|
分析:(1)把除以
化成乘以24,再运用乘法分配律进行简算;
(2)把除以
化成乘以
,再运用乘法分配律进行简算;
(3)运用乘法分配律进行简算;
(4)先算小括号里的减法,再算括号外的除法.
| 1 |
| 24 |
(2)把除以
| 7 |
| 3 |
| 3 |
| 7 |
(3)运用乘法分配律进行简算;
(4)先算小括号里的减法,再算括号外的除法.
解答:解:(1)(
-
+
)÷
=(
-
+
)×24
=
×24-
×24+
×24
=16-9+18
=7+18
=25
(2)
÷
+
×25%
=
×
+
×25%
=
×(
+
)
=
×1
=
(3)
×
+40%×
=
×(
+
)
=
×1
=
(4)
÷(
-
)
=
÷
=
| 2 |
| 3 |
| 3 |
| 8 |
| 3 |
| 4 |
| 1 |
| 24 |
=(
| 2 |
| 3 |
| 3 |
| 8 |
| 3 |
| 4 |
=
| 2 |
| 3 |
| 3 |
| 8 |
| 3 |
| 4 |
=16-9+18
=7+18
=25
(2)
| 1 |
| 4 |
| 7 |
| 3 |
| 4 |
| 7 |
=
| 1 |
| 4 |
| 3 |
| 7 |
| 4 |
| 7 |
=
| 1 |
| 4 |
| 3 |
| 7 |
| 4 |
| 7 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
(3)
| 2 |
| 5 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 2 |
| 5 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 2 |
| 5 |
=
| 2 |
| 5 |
(4)
| 2 |
| 9 |
| 11 |
| 12 |
| 5 |
| 9 |
=
| 2 |
| 9 |
| 13 |
| 36 |
=
| 8 |
| 13 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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