题目内容

计算下列各式:
(1)(-13)+(-8)
(2)-27-(-17)
(3)(-
5
6
)×(-
3
10
)

(4)-1+(-2)-(-3)-5
(5)-24×(-
1
2
+
3
4
-
1
3
)

(6)|-2
1
2
|-(-2.5)+1-|1-2
1
2
|

(7)(-3)×
5
6
×(-
4
5
)×(-
1
4
)

(8)
1
6
+
1
20
+
1
12
+
1
30
(巧算)
(9)-7×(-
22
7
)+26×(-
22
7
)-2×
22
7
(1)(-13)+(-8)=-21;

(2)-27-(-17)=-10;

(3)(-
5
6
)×(-
3
10
)
=
1
4


(4)-1+(-2)-(-3)-5
=-1-2+3-5
=-8+3
=-5;

(5)-24×(-
1
2
+
3
4
-
1
3
)

=24×
1
2
-24×
3
4
+24×
1
3

=12-18+8
=2;

(6)|-2
1
2
|-(-2.5)+1-|1-2
1
2
|

=2.5+2.5+1-1.5
=6-1.5
=4.5;

(7)(-3)×
5
6
×(-
4
5
)×(-
1
4
)

=-3×
5
6
×
4
5
×
1
4

=-
1
2


(8)
1
6
+
1
20
+
1
12
+
1
30

=
10
60
+
3
60
+
5
60
+
2
60

=
1
3


(9)-7×(-
22
7
)+26×(-
22
7
)-2×
22
7

=(7-26-2)×
22
7

=-21×
22
7

=-66.
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