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计算下面各题1325-325+925715+415+2151318-518+7181321-821-221.

题目详情
计算下面各题
13
25
-
3
25
+
9
25

7
15
+
4
15
+
2
15

13
18
-
5
18
+
7
18

13
21
-
8
21
-
2
21
▼优质解答
答案和解析
(1)
13
25
-
3
25
+
9
25

=
10
25
+
9
25

=
19
25


(2)
7
15
+
4
15
+
2
15

=
11
15
+
2
15

=
13
15


(3)
13
18
-
5
18
+
7
18

=
8
18
+
7
18

=
15
18

=
5
6


(4)
13
21
-
8
21
-
2
21

=
5
21
-
2
21

=
3
21

=
1
7