题目内容

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
(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.
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