试题:
怎样简便就怎样计算.
8
27
÷
4
7
÷
7
4

1
25
×
6
27
+
21
27
÷25

5
36
+
10
27
÷
5
9

答案:

我来补答
(1)
8
27
÷
4
7
÷
7
4

=
8
27
÷(
4
7
×
7
4

=
8
27
÷
1
=
8
27


(2)
1
25
×
6
27
+
21
27
÷25

=
1
25
×(
6
27
+
21
27

=
1
25
×1
=
1
25


(3)(
5
36
+
10
27
÷
5
9

=
5
36
×
9
5
+
10
27
×
9
5

=
1
4
+
2
3

=
11
12
 
 
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