问题 解答题
用简便方法计算下面各题.
17
12
×
5
34
×
3
4

5
7
×72-
5
7
×23

14
17
+
14
17
×16

(
1
4
+
1
6
)×24

1
8
×5×
8
9

6
5
×3+
6
5
×6+
6
5
答案

(1)

17
12
×
5
34
×
3
4

=

5
32

(2)

5
7
×72-
5
7
×23,

=

5
7
×(72-23),

=

5
7
×49,

=35;

(3)

14
17
+
14
17
×16,

=

14
17
×(1+16),

=14;

(4)(

1
4
+
1
6
)×24,

=

1
4
×24+
1
6
×24,

=6+4,

=10;

(5)

1
8
×5×
8
9

=

5
9

(6)

6
5
×3+
6
5
×6+
6
5

=

6
5
×(3+6+1),

=

6
5
×10,

=12.

解答题
单项选择题