题目内容

脱式计算.
(1)[
7
10
-(
1
2
+
2
5
×50%)]÷
16
7

(2)
5
4
-
5
4
÷5×
2
3

(3)(9.3×
5
6
-7.3)÷
9
4

(4)
39
5
÷[32×(1-
5
8
)+
18
5
]
分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)[
7
10
-(
1
2
+
2
5
×50%)]÷
16
7

=[
7
10
-(
1
2
+
2
5
×
1
2
)]×
16
7

=[
7
10
-(
1
2
+
1
5
)]×
16
7

=[
7
10
-
7
10
16
7

=0×
16
7

=0;

(2)
5
4
-
5
4
÷5×
2
3

=
5
4
-
5
4
×
1
5
×
2
3

=
5
4
-
1
6

=
13
12


(3)(9.3×
5
6
-7.3)÷
9
4

=(7.75-7.3)×
4
9

=0.45×
4
9

=0.2;

(4)
39
5
÷[32×(1-
5
8
)+
18
5
]

=
39
5
÷[32×
3
8
+
18
5
],
=
39
5
÷[12+
18
5
],
=
39
5
×
5
78

=
1
2
点评:完成脱式计算时,要注意计算过程的完整性,中间不要有太大的跳跃.
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