题目内容

(2012?陆良县模拟)36.8-44.08÷5.8
1
7
13
×90+1
7
13
×26+1
7
13

5
16
×1
1
3
×
3
5
÷
2
15

0.4×4.7×2.5+(2
1
3
+5.3)
[5
1
2
-1.04×(1
2
3
+
5
6
)]÷2.9.
分析:(1)先算除法,再算减法;
(2)运用乘法分配律简算;
(3)按照从左到右的顺序计算;
(4)先运用乘法交换律简算,再运用加法结合律简算;
(5)先算小括号里面的加法,再算中括号里面的乘法,然后算中括号里面里面的减法,最后算括号外的除法.
解答:解:(1)36.8-44.08÷5.8,
=36.8-7.6,
=29.2;

(2)1
7
13
×90+1
7
13
×26+1
7
13

=1
7
13
×(90+26+1)
=
20
13
×117,
=180;

(3)
5
16
×1
1
3
×
3
5
÷
2
15

=
5
16
×
4
3
×
3
5
×
15
2

=
5
12
×
3
5
×
15
2

=
1
4
×
15
2

=
15
8


(4)0.4×4.7×2.5+(2
1
3
+5.3),
=0.4×2.5×4.7+(2
1
3
+5.3),
=1×4.7+(2
1
3
+5.3),
=4.7+2
1
3
+5.3,
=4.7+5.3+2
1
3

=10+2
1
3

=12
1
3


(5)[5
1
2
-1.04×(1
2
3
+
5
6
)]÷2.9,
=[5
1
2
-1.04×2.5]÷2.9,
=[5
1
2
-2.6]÷2.9,
=2.9÷.9,
=1.
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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