题目内容

计算下列各题.
(1)
8
15
-
5
9
-
4
9

(2)(-24)×(
1
8
-
1
3
+
1
4
)

(3)2-6÷(-2)×(-
1
2
)

(4)(-1)2010+(1-0.5)×
1
3
×[2-(-3)2]
(1)
8
15
-
5
9
-
4
9

=
8
15
-(
5
9
+
4
9

=
8
15
-1
=-
7
15


(2)(-24)×(
1
8
-
1
3
+
1
4
)

=-24×
1
8
+24×
1
3
-24×
1
4

=-3+8-6
=-1;

(3)2-6÷(-2)×(-
1
2
)

=2-3×
1
2

=2-1.5
=0.5;

(4)(-1)2010+(1-0.5)×
1
3
×[2-(-3)2]

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

=-
1
6
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