问题 解答题
计算下面各题,能简算的要简算
5
9
×
3
5
÷
2
9
4
15
+
5
7
×
21
25
-
1
5
9
11
+
9
11
÷9
30×(
1
2
+
1
5
-
1
6
答案

(1)

5
9
×
3
5
÷
2
9

=

5
9
×
3
5
×
9
2

=

1
3
×
9
2

=

3
2

(2)

4
15
+
5
7
×
21
25
-
1
5

=

4
15
+
3
5
-
1
5

=

13
15
-
1
5

=

2
3

(3)9×

9
11
+
9
11
÷9,

=

81
11
+
1
11

=

82
11

(4)30×(

1
2
+
1
5
-
1
6
),

=30×

1
2
+30×
1
5
-30×
1
6

=15+6-5,

=21-5,

=16.

单项选择题
单项选择题