问题 解答题
计算下面各题,能简算的要简算.
(
3
4
-
1
8
5
12
1
7
×
6
13
+
8
13
×
1
7
5
6
÷
8
9
÷
1
3
8
13
÷7+
1
7
×
5
13
20-
7
9
÷
7
8
1
5
×8÷
4
5
答案

(1)(

3
4
-
1
8
÷
5
12

=

5
8
÷
5
12

=

3
2

(2)

1
7
×
6
13
+
8
13
×
1
7

=(

6
13
+
8
13
)×
1
7

=

14
13
×
1
7

=

2
13

(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

(4)20-

7
9
÷
7
8

=20-

8
9

=19

1
9

判断题
单项选择题