早教吧 育儿知识 作业答案 考试题库 百科 知识分享

脱式计算(能简便计算的要简便计算):80÷(1-84%)1.3×35%+8.7×35%70+70×25%5-5×25+35[12-(34-35)]÷71079÷115+29×511

题目详情
脱式计算(能简便计算的要简便计算):
80÷(1-84%)        

1.3×35%+8.7×35%     

70+70×25%
5-5×
2
5
+
3
5
[
1
2
-(
3
4
-
3
5
)]÷
7
10
        
7
9
÷
11
5
+
2
9
×
5
11
▼优质解答
答案和解析
①80÷(1-84%)
=80÷(1-0.84)
=80÷0.16
=500;

②1.3×35%+8.7×35%
=(1.3+8.7)×0.35
=10×0.35
=3.5;

③70+70×25%
=70+70×0.25
=70+17.5
=87.5;

④5-5×
2
5
+
3
5

=5-5×0.4+0.6
=5-2+0.6
=3+0.6
=3.6;

⑤[
1
2
-(
3
4
-
3
5
)]÷
7
10
  
=[
1
2
3
20
7
10

=
7
20
×
10
7

=
1
2


7
9
÷
11
5
+
2
9
×
5
11

=(
7
9
+
2
9
5
11

=
5
11

=
5
11