问题 解答题
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]
答案

(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

问答题
多项选择题