题目内容

计算题:
(1)-9+12-(-3)+8
(2)-5+6÷(-2)×
1
3

(3)(-1)2008-54×(
5
6
-
4
9
+
1
3
)

(4)-14-(1-0.5)×
1
3
×[2-(-3)2]
(1)-9+12-(-3)+8
=-9+12+3+8
=14;

(2)-5+6÷(-2)×
1
3

=-5-3×
1
3

=-5-1
=-6;

(3)(-1)2008-54×(
5
6
-
4
9
+
1
3
)

=1-54×
5
6
+54×
4
9
-54×
1
3

=1-45+24-18
=-38;

(4)-14-(1-0.5)×
1
3
×[2-(-3)2]

=-1-
1
2
×
1
3
×[2-9]
=1-
1
6
×(-7)
=-1+
7
6

=
1
6
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