题目内容
怎样简便就怎样算.
(15+
|
|
13×
| ||||||||||||||||
2005×
|
(45×
|
|
(1)(15+
)×
,
=15×
+
×
,
=2+
,
=2
;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)13×
+
,
=(13+1)×
,
=14×
,
=3;
(4)2005×
,
=(2004+1)×
,
=2004×
+
,
=2003+
,
=2003
;
(5)(45×
+5)÷
,
=(27+5)÷
,
=32×
,
=40;
(6)
+
×
,
=
+
,
=
.
| 5 |
| 7 |
| 2 |
| 15 |
=15×
| 2 |
| 15 |
| 5 |
| 7 |
| 2 |
| 15 |
=2+
| 2 |
| 21 |
=2
| 2 |
| 21 |
(2)
| 2 |
| 11 |
| 7 |
| 10 |
| 2 |
| 11 |
| 3 |
| 10 |
=
| 2 |
| 11 |
| 7 |
| 10 |
| 3 |
| 10 |
=
| 2 |
| 11 |
=
| 2 |
| 11 |
(3)13×
| 3 |
| 14 |
| 3 |
| 14 |
=(13+1)×
| 3 |
| 14 |
=14×
| 3 |
| 14 |
=3;
(4)2005×
| 2003 |
| 2004 |
=(2004+1)×
| 2003 |
| 2004 |
=2004×
| 2003 |
| 2004 |
| 2003 |
| 2004 |
=2003+
| 2003 |
| 2004 |
=2003
| 2003 |
| 2004 |
(5)(45×
| 3 |
| 5 |
| 4 |
| 5 |
=(27+5)÷
| 4 |
| 5 |
=32×
| 5 |
| 4 |
=40;
(6)
| 7 |
| 3 |
| 2 |
| 3 |
| 6 |
| 5 |
=
| 7 |
| 3 |
| 4 |
| 5 |
=
| 47 |
| 15 |
练习册系列答案
相关题目