题目内容
请你用自己喜欢的方法计算
|
24×(
|
| ||||||||||||
|
|
分析:(1)(5)把除法改为乘法,约分计算;
(2)运用乘法分配律简算;
(3)把28看作(27+1),运用乘法分配律简算;
(4)把除法改为乘法,运用乘法分配律简算.
(2)运用乘法分配律简算;
(3)把28看作(27+1),运用乘法分配律简算;
(4)把除法改为乘法,运用乘法分配律简算.
解答:解:(1)
×
÷
,
=
×
×18,
=1;
(2)24×(
+
),
=24×
+24×
,
=9+4,
=13;
(3)
×28,
=
×(27+1),
=
×27+
,
=26
;
(4)
÷5+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(5)
×4÷
×4,
=
×4×
×4,
=
.
5 |
6 |
1 |
15 |
1 |
18 |
=
5 |
6 |
1 |
15 |
=1;
(2)24×(
3 |
8 |
1 |
6 |
=24×
3 |
8 |
1 |
6 |
=9+4,
=13;
(3)
26 |
27 |
=
26 |
27 |
=
26 |
27 |
26 |
27 |
=26
26 |
27 |
(4)
1 |
3 |
2 |
3 |
1 |
5 |
=
1 |
3 |
1 |
5 |
2 |
3 |
1 |
5 |
=(
1 |
3 |
2 |
3 |
1 |
5 |
=1×
1 |
5 |
=
1 |
5 |
(5)
4 |
8 |
5 |
8 |
=
4 |
8 |
8 |
5 |
=
64 |
5 |
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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