试题:
用递等式计算.
3
4
÷4÷
9
8
5
18
÷(
1
3
+
1
2
4
7
×
3
5
+
3
7
÷
5
3
8-2.7÷
9
13
7
6
÷(
8
3
×
7
2
6
2
7
×3
1
3
÷6
2
7
×
3
10

答案:

我来补答
(1)
3
4
÷4÷
9
8

=
3
16
÷
9
8

=
1
6


(2)
5
18
÷(
1
3
+
1
2

=
5
18
÷
5
6

=
1
3


(3)
4
7
×
3
5
+
3
7
÷
5
3

=(
4
7
+
3
7
)×
3
5

=1×
3
5

=
3
5


(4)8-2.7÷
9
13

=8-3.9
=4.1;

(5)
7
6
÷(
8
3
×
7
2

=
7
6
÷
28
3

=
1
8


(6)6
2
7
×3
1
3
÷6
2
7
×
3
10

=(6
2
7
÷6
2
7
)×(3
1
3
×
3
10

=1×1
=1.
 
 
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