题目内容

计算,能简便的用简便方法.
13
14
×13+
13
14
8
15
×
8
9
+
8
9
×
7
15
23×
14
39
+14×
16
39
6×[
8
9
-(
1
2
-
1
6
)]
7
8
+
1
6
+
2
3
)×48 
1
4
+
1
5
)×20.
(1)
13
14
×13+
13
14

=
13
14
×(13+1)
=
13
14
×14
=13;

(2)
8
15
×
8
9
+
8
9
×
7
15

=(
8
15
+
7
15
)×
8
9

=1×
8
9

=
8
9


(3)23×
14
39
+14×
16
39

=23×
14
39
+
14
39
×16
=(23+16)×
14
39

=39×
14
39

=14;

(4)6×[
8
9
-(
1
2
-
1
6
)]
=6×[
8
9
-
1
3
]
=6×
5
9

=
10
3


(5)(
7
8
+
1
6
+
2
3
)×48 
=
7
8
×48+
1
6
×48+
2
3
×48 
=42+8+32
=82;

(6)(
1
4
+
1
5
)×20
=
1
4
×20+
1
5
×20
=5+4
=9.
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