问题 解答题
计算下面各题:
(1)2011+450÷15×30(2)10÷
5
8
×
4
15
(3)
9
20
÷6+
1
6
×
1
20
(4)
9
10
÷[
1
2
×(
6
5
-
3
10
)].
答案

(1)2011+450÷15×30,

=2011+30×30,

=2011+900,

=2911;

(2)10÷

5
8
×
4
15

=16×

4
15

=

64
15

(3)

9
20
÷6+
1
6
×
1
20

=

9
20
×
1
6
+
1
6
×
1
20

=(

9
20
+
1
20
)×
1
6

=

1
2
×
1
6

=

1
12

(4)

9
10
÷[
1
2
×(
6
5
-
3
10
)],

=

9
10
÷[
1
2
×
9
10
],

=

9
10
÷
9
20

=2.

单项选择题
单项选择题