计算题:(1)-9+12-(-3)+8(2) -5+6÷(-2)× 1 3 ;(3) (-1 ) 2008 -54×( 5 6

2025-06-27 20:53:36
推荐回答(1个)
回答1:

(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