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脱式计算.168.1÷(4.3×2-0.4)57×724+15÷45(1-1100×70)÷2797-56-1673×12.5×67×8(13-15)×45.

题目详情
脱式计算.
168.1÷(4.3×2-0.4)
5
7
×
7
24
+
1
5
÷
4
5
       
(1-
1
100
×70)÷
2
7
9
7
-
5
6
-
1
6
        
7
3
×12.5×
6
7
×8           
1
3
-
1
5
)×45.
▼优质解答
答案和解析
(1)168.1÷(4.3×2-0.4)
=168.1÷(8.6-0.4)
=168.1÷8.2
=20.5;
(2)
5
7
×
7
24
+
1
5
÷
4
5

=
5
24
+
1
4

=
11
24

(3)(1-
1
100
×70)÷
2
7

=(1-
7
10
)÷
2
7

=
3
10
×
7
2

=
21
20

(4)
9
7
-
5
6
-
1
6

=
9
7
-(
5
6
+
1
6

=
9
7
-1
=
2
7

(5)
7
3
×12.5×
6
7
×8
=(
7
3
×
6
7
)×(12.5×8)
=2×100
=200;
(6)(
1
3
-
1
5
)×45
=
1
3
×45-
1
5
×45
=15-9