(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) - 1 4 -(1-0.5)×
1
3 ×[2- (-3) 2 ]
=-1-
1
2 ×
1
3 ×[2-9]
=1-
1
6 ×(-7)
=-1+
7
6
=
1
6 .
(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) - 1 4 -(1-0.5)×
1
3 ×[2- (-3) 2 ]
=-1-
1
2 ×
1
3 ×[2-9]
=1-
1
6 ×(-7)
=-1+
7
6
=
1
6 .