Câu 2:Tính bằng cách thuận tiện:2012+2012+2012+2012+2012.7-2012
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![](https://rs.olm.vn/images/avt/0.png?1311)
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a, \(\dfrac{12}{17}\) x \(\dfrac{21}{63}\) x \(\dfrac{51}{9}\)
= \(\dfrac{3\times4}{17}\) x \(\dfrac{3\times7}{9\times7}\) x \(\dfrac{17\times3}{9}\)
= \(\dfrac{4}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2014 x ( 2012 -1012 )
= 2014 x 1000
= 2014000
2012x 2013 +100
= (2013 x100 )+2012
= 203213
k minh nha ban
2014 x ( 2012 -1012 )
= 2014 x 1000
= 2014000
2012x 2013 +100
= (2013 x100 )+2012
= 203213
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{20082008}{20122012}\times\frac{2012}{2010}\)
\(=\frac{2008.10001}{2012.10001}\times\frac{2012}{2010}\)
\(=\frac{2008}{2012}\times\frac{2012}{2010}\)
\(=\frac{2008\times2012}{2012\times2010}\)
\(=\frac{2008}{2010}=\frac{1004}{1005}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2014 : 25 - 2012 : 25
= (2014 - 2012) : 25
= 2 : 25
= 0,08
![](https://rs.olm.vn/images/avt/0.png?1311)
( 2014 x 2015 - 2016 ) : ( 2012 + 2013 x 2014 )
= ( 4058210 - 2016 ) : ( 2012 + 4054182 )
= 4056194 : 4056194
= 1
![](https://rs.olm.vn/images/avt/0.png?1311)
2001/2002= 1 -1/2002
2011/2012= 1- 1/2012
1/2002>1/2012 => 2001/2002 < 2011/2012
=2012x(1+1+1+1+7-1)
=2012.10
=20120
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