问题 解答题
8
13
÷7+
1
7
×
5
13
1
2
-4×
1
4
÷4
4
5
+(
1
5
+
3
4
×
4
7
)
5
14
÷[
6
7
×(
2
3
+
1
6
)]
答案

(1)

8
13
÷7+
1
7
×
5
13

=

1
7
×(
8
13
+
5
13
),

=

1
7
×1,

=

1
7

(2)

1
2
-4×
1
4
÷4
4
5
+(
1
5
+
3
4
×
4
7
),

=

1
2
-4×
1
4
÷4
4
5
+(
1
5
+
3
7
),

=

1
2
-4×
1
4
÷4
4
5
+
22
35

=

1
2
-1÷4
4
5
+
22
35

=

1
2
-
4
24
+
22
35

=

1
3
+
22
35

=

101
105

(3)

5
14
÷[
6
7
×(
2
3
+
1
6
)],

=

5
14
÷[
6
7
×
5
6
],

=

5
14
÷
5
7

=

1
2

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