问题 解答题
用简便方法计算下面各题.
1
4
+
1
5
)×20
9
26
÷
8
13
×
8
27
101×
1
7
-
1
7
6
47
×48
16
39
÷
9
14
+
16
39
×
4
9
答案

(1)(

1
4
+
1
5
)×20,

=20×

1
4
+
1
5
×20,

=5+4,

=9;

(2)

9
26
÷
8
13
×
8
27

=

9
26
×
13
8
×
8
27

=

1
2

(3)101×

1
7
-
1
7

=(101-1)×

1
7

=

100
7

=14

2
7

(4)

6
47
×48,

=

6
47
×(47+1),

=

6
47
×47+
6
47
×1

=6+

6
47

=6

6
47

(5)

16
39
÷
9
14
+
16
39
×
4
9

=

16
39
×
14
9
+
16
39
×
4
9

=

16
39
×(
14
9
+
4
9
),

=

16
39
×2,

=

32
39

多项选择题
单项选择题 A1/A2型题