问题 解答题
(39+
13
14
)×
1
13
(
3
4
-
1
8
5
12
8
13
÷7+
1
7
×
5
13
答案

(1)(39+

13
14
)×
1
13

=39×

1
13
+
13
14
×
1
13

=3+

1
14

=3

1
14

(2)(

3
4
-
1
8
)÷
5
12

=

5
8
×
12
5

=

3
2

(3)

8
13
÷7+
1
7
×
5
13

=

8
13
×
1
7
+
1
7
×
5
13

=(

8
13
+
5
13
)×
1
7

=1×

1
7

=

1
7

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