问题 解答题
用简便方法计算.
(1)(
3
4
+
5
6
)×24
(2)
13
15
×
8
9
+
8
9
×
2
15
(3)
11
12
×25-
11
12
(4)85×
5
84
答案

(1)(

3
4
+
5
6
)×24,

=

3
4
×24+
5
6
×24,

=18+20,

=38;

(2)

13
15
×
8
9
+
8
9
×
2
15

=(

13
15
+
2
15
)×
8
9

=

8
9

(3)

11
12
×25-
11
12

=

11
12
×(25-1),

=

11
12
×24,

=22;

(4)85×

5
84

=(84+1)×

5
84

=84×

5
84
+1×
5
84

=5+

5
84

=5

5
84

问答题
单项选择题 B1型题