题目内容

计算:
(1)|-2|-(-2.5)-|1-4|
(2)2×(-3)2-33-6÷(-2)
(3)[
25
24
-
3
8
+
1
6
-
3
4
)×24]÷5             
(4)29
12
13
×(-26)
(1)|-2|-(-2.5)-|1-4|
=2+2.5-3
=1.5;

(2)2×(-3)2-33-6÷(-2)
=2×9-27+3
=18-27+3
=-6;

(3)[
25
24
-
3
8
+
1
6
-
3
4
)×24]÷5
=[
25
24
-
(9+4-18)]÷5
=[
25
24
+5]÷5
=
5
24
+1
=1
5
24

             
(4)29
12
13
×(-26)

=(30-
1
13
)×(-26)
=-30×26+
1
13
×26
=-780+2
=-778.
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