Tính bằng cách thuận tiện 2012 x 2013 + 100
2014 x 2012 - 1012
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( 2014 x 2015 - 2016 ) : ( 2012 + 2013 x 2014 )
= ( 4058210 - 2016 ) : ( 2012 + 4054182 )
= 4056194 : 4056194
= 1
(2011/2012+2012/2013+2013/2014+...+3026/3027) x (1/5-2/3:3/10)
= (2011/2012+2012/2013+2013/2014+...+3026/3027) x (1/5-2/10)
= (2011/2012+2012/2013+2013/2014+...+3026/3027) x (1/5-1/5)
= (2011/2012+2012/2013+2013/2014+...+3026/3027) x 0
= 0
2014 : 25 - 2012 : 25
= (2014 - 2012) : 25
= 2 : 25
= 0,08
( 2013 x 2014 + 2014 x 2015 + 2015 x 2016) x ( 1 + 1/3 - 4/3)
=( 2013 x 2014 + 2014 x 2015 + 2015 x 2016) x ( 4/3 - 4/3)
=( 2013 x 2014 + 2014 x 2015 + 2015 x 2016) x 0
=0
Ta có: \(\left(2013\cdot2014+2014\cdot2015+2015\cdot2016\right)\left(1+\dfrac{1}{3}-\dfrac{4}{3}\right)\)
\(=\left(2013\cdot2014+2014\cdot2015+2015\cdot2016\right)\left(\dfrac{3}{3}+\dfrac{1}{3}-\dfrac{4}{3}\right)\)
=0
a, \(\dfrac{12}{17}\) x \(\dfrac{21}{63}\) x \(\dfrac{51}{9}\)
= \(\dfrac{3\times4}{17}\) x \(\dfrac{3\times7}{9\times7}\) x \(\dfrac{17\times3}{9}\)
= \(\dfrac{4}{3}\)
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