题目内容
能简算的要简算 12×(
|
15×
| ||||||||||||||
|
| ||||||||||||||
270-144×
|
|
分析:(1)运用乘法的分配律进行简算,
(2)把15化成1+14,再运用乘法的分配律简算,
(3)先算乘法,再加法,
(4)运用乘法的分配律进行简算,
(5)先算乘法,再减法,
(6)直接约分计算即可.
(2)把15化成1+14,再运用乘法的分配律简算,
(3)先算乘法,再加法,
(4)运用乘法的分配律进行简算,
(5)先算乘法,再减法,
(6)直接约分计算即可.
解答:解:(1)12×(
+
),
=12×
+12×
,
=9+10,
=19;
(2)15×
,
=(1+14)×
,
=1×
+14×
,
=
+3,
=3
;
(3)
+
×
,
=
+
,
=
;
(4)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(5)270-144×
,
=270-120,
=150;
(6)
×
×32,
=
×32,
=15.
3 |
4 |
5 |
6 |
=12×
3 |
4 |
5 |
6 |
=9+10,
=19;
(2)15×
3 |
14 |
=(1+14)×
3 |
14 |
=1×
3 |
14 |
3 |
14 |
=
3 |
14 |
=3
3 |
14 |
(3)
1 |
6 |
4 |
9 |
3 |
4 |
=
1 |
6 |
1 |
3 |
=
1 |
2 |
(4)
2 |
9 |
3 |
5 |
2 |
9 |
2 |
5 |
=
2 |
9 |
3 |
5 |
2 |
5 |
=
2 |
9 |
=
2 |
9 |
(5)270-144×
5 |
6 |
=270-120,
=150;
(6)
3 |
4 |
5 |
8 |
=
15 |
32 |
=15.
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.
练习册系列答案
相关题目