问题 解答题
下面各题对吗?把不对的改正过来.
7-3×
5
12
  改正:
=
5
12

=
5
3

7
13
+
6
13
×
13
12
   改正:
=
13
12

=
13
12
答案

(1)错误,

改正:

7-3×

5
12

=7-

5
4

=

23
4

(2)错误,

改正:

7
13
+
6
13
×
13
12

=

7
13
+
1
2

=

27
26

解答题
单项选择题