题目内容

用简便方法计算
(1)22×
55
56
+22×
1
56

(2)1+44×17÷11÷34
(3)(
5
7
-
2
3
)÷
5
21
×5
(4)2012÷2012
2012
2013
(1)22×
55
56
+22×
1
56

=22
55
56
+
1
56

=22×1,
=22;

(2)1+44×17÷11÷34,
=1+44×17×
1
11
×
1
34

=1+2,
=3;

(3)(
5
7
-
2
3
)÷
5
21
×5,
=(
5
7
-
2
3
)×
21
5
×
5,
=
5
7
×21-
2
3
×21

=15-14,
=1;
(4)2012÷2012
2012
2013

=2012÷
2012×2013+2012
2013

=2012÷
2012×(2013+1)
2013

=2012×
2013
2012×(2013+1)

=
2013
2013+1

=
2013
2014
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