用简便方法计算下面各题.1712×534×3457×72-57×231417+1417×16(14+16)×2418×5×8965×3+65×6+65.-数学

题文

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
题型:解答题  难度:中档

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