题目内容

计算,能简算的要简算.
5
6
-
3
10
+
5
6
-
7
10
=

11
8
-( 
5
6
+
3
8
)=

5
9
-(
2
9
-
1
5
)=
6
7
-( 
11
14
-
1
2
 )=
5
9
+
4
11
+
6
11
+
4
9
=
5
7
+
1
4
-
5
7
=
分析:(1)(5)(6)题,运用加法交换律与结合律;
(2)(3)(4)题,运用减法的性质以及加法交换律与结合律简算.
解答:解:(1)
5
6
-
3
10
+
5
6
-
7
10

=(
5
6
+
5
6
)-(
3
10
+
7
10
),
=
5
3
-1,
=
2
3


(2)
11
8
-( 
5
6
+
3
8
),
=
11
8
-
5
6
-
3
8

=(
11
8
-
3
8
)-
5
6

=1-
5
6

=
1
6


(3)
5
9
-(
2
9
-
1
5
),
=
5
9
-
2
9
+
1
5

=
1
3
+
1
5

=
8
15


(4)
6
7
-(
11
14
-
1
2
),
=
6
7
-
2
7

=
4
7


(5)
5
9
+
4
11
+
6
11
+
4
9

=(
5
9
+
4
9
)+(
4
11
+
6
11
),
=1+
10
11

=1
10
11


(6)
5
7
+
1
4
-
5
7

=(
5
7
-
5
7
)+
1
4

=
1
4
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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