问题 解答题
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
答案

(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.

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