题目内容
计算,能简算的要简算
36×
|
|
6.28×3.7+6.28×6.3 | ||||||||||||
|
80.8×10.1-8.08 |
|
分析:(1)根据乘法分配律进行简算;
(2)先算除法,再算加法;
(3)根据乘法分配律进行简算;
(4)先算乘法,再根据加法结合律进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
(2)先算除法,再算加法;
(3)根据乘法分配律进行简算;
(4)先算乘法,再根据加法结合律进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
解答:解:(1)36×
-
,
=(36-1)×
=35×
,
=18;
(2)
+
÷
,
=
+
,
=
;
(3)6.28×3.7+6.28×6.3,
=6.28×(3.7+6.3),
=6.28×10,
=62.8;
(4)
+
×9+
,
=
+
+
,
=
+(
+
),
=
+1,
=1
;
(5)80.8×10.1-8.08,
=8.08×101-8.08,
=8.08×(101-1),
=8.08×100,
=808;
(6)
-
×
,
=
×(1-
),
=
×
,
=
.
18 |
35 |
18 |
35 |
=(36-1)×
18 |
35 |
=35×
18 |
35 |
=18;
(2)
1 |
8 |
2 |
7 |
1 |
3 |
=
1 |
8 |
6 |
7 |
=
55 |
56 |
(3)6.28×3.7+6.28×6.3,
=6.28×(3.7+6.3),
=6.28×10,
=62.8;
(4)
5 |
7 |
1 |
13 |
4 |
13 |
=
5 |
7 |
9 |
13 |
4 |
13 |
=
5 |
7 |
9 |
13 |
4 |
13 |
=
5 |
7 |
=1
5 |
7 |
(5)80.8×10.1-8.08,
=8.08×101-8.08,
=8.08×(101-1),
=8.08×100,
=808;
(6)
1 |
3 |
1 |
3 |
5 |
6 |
=
1 |
3 |
5 |
6 |
=
1 |
3 |
1 |
6 |
=
1 |
18 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
练习册系列答案
相关题目