题目内容
计算,能简便算就简便算.
÷
×10
×
÷
2014×
×
×(2014×42×85)
×
-
÷15×13.
3 |
14 |
15 |
28 |
9 |
5 |
2 |
3 |
18 |
35 |
2014×
2012 |
2013 |
1 |
21 |
1 |
17 |
19 |
17 |
13 |
15 |
2 |
17 |
(1)
÷
×10
=
×10
=4;
(2)
×
÷
=
×
=
;
(3)2014×
=(2013+1)×
=2013×
+1×
=2012+
=2012
;
(4)
×
×(2014×42×85)
=(
×42)×(
×85)×2014
=2×5×2014
=10×2014
=20140;
(5)
×
-
÷15×13
=
×
-
×(
×13)
=
×
-
×
=(
-
)×
=1×
=
.
3 |
14 |
15 |
28 |
=
2 |
5 |
=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 |
2012 |
2013 |
=2012+
2012 |
2013 |
=2012
2012 |
2013 |
(4)
1 |
21 |
1 |
17 |
=(
1 |
21 |
1 |
17 |
=2×5×2014
=10×2014
=20140;
(5)
19 |
17 |
13 |
15 |
2 |
17 |
=
19 |
17 |
13 |
15 |
2 |
17 |
1 |
15 |
=
19 |
17 |
13 |
15 |
2 |
17 |
13 |
15 |
=(
19 |
17 |
2 |
17 |
13 |
15 |
=1×
13 |
15 |
=
13 |
15 |
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