问题 解答题
递等式计算,能简便的用简便方法.
4
9
×
5
13
+
5
13
×
5
9
5
8
×
2
7
×16
49×
11
48
34
35
×12+
12
35
3
4
+
1
5
)×12×35
7
8
+
1
6
+
2
3
)×48.
答案

(1)

4
9
×
5
13
+
5
13
×
5
9

=(

4
9
+
5
9
)×
5
13

=1×

5
13

=

5
13

(2)

5
8
×
2
7
×16,

=

5
8
×16×
2
7

=10×

2
7

=2

6
7

(3)49×

11
48

=48×

11
48
+1×
11
48

=11+

11
48

=11

11
48

(4)

34
35
×12+
12
35

=12×(

34
35
+
1
35
),

=12×1,

=12;

(5)(

3
4
+
1
5
)×12×35,

=

3
4
×12×35+
1
5
×12×35,

=9×35+12×7,

=315+84,

=499;

(6)(

7
8
+
1
6
+
2
3
)×48,

=

7
8
×48+
1
6
×48+
2
3
×48,

=42+8+32,

=82.

单项选择题 A3/A4型题
判断题