题目内容

怎样简便就怎样算:
4.5+5.5×3.6×0.1;   
5-
1
3
+
1
2
-
1
6
;      
1
4
×0.16×
3
8
×0.124×
1
2
÷4×
1
2
;    
10.8×(
2
3
+
5
6
+
4
9
);     
(3.25-0.8×
5
8
)÷0.1.
分析:根据四则运算顺序进行计算,能用简便方法计算的用简便方法计算,10.8×(
2
3
+
5
6
+
4
9
)可用乘法分配律计算.
解答:解:(1)4.5+5.5×3.6×0.1,
=4.5+19.8×0.1,
=4.5+1.98,
=6.48;

(2)5-
1
3
+
1
2
-
1
6

=4
2
3
+
1
2
-
1
6

=5
1
6
-
1
6

=5;

(3)
1
4
×0.16×
3
8
×0.124×
1
2
÷4×
1
2

=0.04×
3
8
×0.124×
1
2
÷4×
1
2

=0.015×0.124×
1
2
÷4×
1
2

=0.00186×
1
2
÷4×
1
2

=0.00093÷4×
1
2

=0.0002325×
1
2

=0.00011625;

(4)10.8×(
2
3
+
5
6
+
4
9
),
=10.8×
2
3
+10.8×
5
6
+10.8×
4
9

=7.2+9+4.8,
=21;

(5)(3.25-0.8×
5
8
)÷0.1,
=(3.25-0.5)÷0.1,
=2.75÷0.1,
=27.5.
点评:主要考查学生对于四则运算顺序及乘法分配律的理解.
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