题目内容

怎样简便怎样算.
5
6
×
7
25
×6
2
5
×
3
14
×
2
3
3
7
+
1
2
)×14
5
8
×
5
8
+
5
8
×
3
8
100×
2
99
5
14
×
7
25
×
5
8
×
2
3
分析:(1)根据乘法交换律进行计算;
(2)根据乘法结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据乘法分配律进行计算;
(6)根据乘法结合律进行计算.
解答:解:
(1)
5
6
×
7
25
×6,
=
5
6
×6×
7
25

=5×
7
25

=
7
5


(2)
2
5
×
3
14
×
2
3

=
2
5
×(
3
14
×
2
3
),
=
2
5
×
1
7

=
2
35


(3)(
3
7
+
1
2
)×14,
=
3
7
×14+
1
2
×14,
=6+7,
=13;

(4)
5
8
×
5
8
+
5
8
×
3
8

=
5
8
×(
5
8
+
3
8
),
=
5
8
×1,
=
5
8


(5)100×
2
99

=(99+1)×
2
99

=99×
2
99
+1×
2
99

=2+
2
99

=2
2
99


(6)
5
14
×
7
25
×
5
8
×
2
3

=(
5
14
×
7
25
)×(
5
8
×
2
3
),
=
1
10
×
5
12

=
1
24
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网