题目内容

计算,能简便算就简便算.
3
14
÷
15
28
×10
9
5
×
2
3
÷
18
35

2014×
2012
2013

1
21
×
1
17
×(2014×42×85)
19
17
×
13
15
-
2
17
÷15×13.
(1)
3
14
÷
15
28
×10
=
2
5
×10
=4;

(2)
9
5
×
2
3
÷
18
35

=
6
5
×
35
18

=
7
3


(3)2014×
2012
2013

=(2013+1)×
2012
2013

=2013×
2012
2013
+1×
2012
2013

=2012+
2012
2013

=2012
2012
2013


(4)
1
21
×
1
17
×(2014×42×85)
=(
1
21
×42)×(
1
17
×85)×2014
=2×5×2014
=10×2014
=20140;

(5)
19
17
×
13
15
-
2
17
÷15×13
=
19
17
×
13
15
-
2
17
×(
1
15
×13)
=
19
17
×
13
15
-
2
17
×
13
15

=(
19
17
-
2
17
)×
13
15

=1×
13
15

=
13
15
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