题目内容

用递等式计算,能简便的要简便.
2
5
+
2
9
+
7
9
+
4
5

2
8
11
-(
8
11
-
2
5
9
8
+
1
8
-
6
7
-
1
7
1
2
+
2
3
+
3
5
37
16
-
13
17
-
17
16
-
4
17
3
8
+
3
4
-
3
8
+
3
4
2
5
+
2
9
+
7
9
+
4
5

=(
2
5
+
4
5
)+(
2
9
+
7
9

=1
1
5
+1
=2
1
5


2
8
11
-(
8
11
-
2
5

=2
8
11
-
8
11
+
2
5

=2+
2
5

=2
2
5


9
8
+
1
8
-
6
7
-
1
7

=(
9
8
+
1
8
)-(
6
7
+
1
7

=1
1
4
-1
=
1
4


1
2
+
2
3
+
3
5

=1
1
6
+
3
5

=1
23
30


37
16
-
13
17
-
17
16
-
4
17

=(
37
16
-
17
16
)-(
13
17
+
4
17

=
20
16
-1
=
1
4


3
8
+
3
4
-
3
8
+
3
4

=(
3
8
-
3
8
)+(
3
4
+
3
4

=1
1
2
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网