Tính bằng cách thuận tiện nhất
2014 x 512 +2015 x 488
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( 2014 x 2015 - 2016 ) : ( 2012 + 2013 x 2014 )
= ( 4058210 - 2016 ) : ( 2012 + 4054182 )
= 4056194 : 4056194
= 1
( 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 = \(\dfrac{27}{512}\) \(\times\) \(\dfrac{327}{213}\) \(\times\) \(\dfrac{512}{57}\) \(\times\) \(\dfrac{213}{54}\) \(\times\) \(\dfrac{57}{327}\)
A = \(\dfrac{27\times327\times512\times213\times57}{54\times327\times512\times213\times57}\)
A = \(\dfrac{27}{54}\)
A = \(\dfrac{1}{2}\)
145/2014 x 35/54 + 145/2014x 19/54
= 145/2014 x ( 35/54 + 19/54 )
= 145/2014 x 1
= 145/2014
Chúc Bn hok tốt :3
2014 x 512 + 2015 x 488
= 2014 x 512 + ( 2014 + 1 ) x 488
= 2014 x 512 + 2014 x 488 + 488
= 2014 x ( 512 + 488 ) + 488
= 2014 x 1000 + 488
= 2 014 000 + 488
= 2 014 488
\(\text{2014 x 512 + 2015 x 488 = 2014 x 512 + ( 2014 + 1 ) x 488 = 2014 x 512 + 2014 x 488 + 488 = 2014 x ( 512 + 488 ) + 488 = 2014 x 1000 + 488 = 2 014 000 + 488 = 2 014 488}\)