2014 x 1008 - 1008 / 4026 + 2014 x 2013
nhớ trinh bày cách làm ai nhanh mik kick cho
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20 tháng 7 2017
\(\dfrac{x+1}{2014}+\dfrac{x+2}{2013}+.....+\dfrac{x+1007}{1008}=\dfrac{x+1008}{1007}+\dfrac{x+1009}{1006}+........+\dfrac{x+2014}{1}\)\(\Leftrightarrow\left(\dfrac{x+1}{2014}+1\right)+\left(\dfrac{x+2}{2013}+1\right)+...+\left(\dfrac{x+1007}{1008}+1\right)=\left(\dfrac{x+1008}{1007}+1\right)+\left(\dfrac{x+1009}{1006}+1\right)+...+\left(\dfrac{x+2014}{1}+1\right)\)\(\Leftrightarrow\dfrac{x+2015}{2014}+\dfrac{x+2015}{2013}+...+\dfrac{x+1007}{1008}=\dfrac{x+2015}{1007}+\dfrac{x+1009}{1006}+...+\dfrac{x+2014}{1}\)\(\Leftrightarrow\dfrac{x+2015}{2014}+\dfrac{x+2015}{2013}+...+\dfrac{x+2015}{1008}-\dfrac{x+1008}{1007}-\dfrac{x+2015}{1006}-...-\dfrac{x+2015}{1}=0\)\(\Leftrightarrow\left(x+2015\right)\left(\dfrac{1}{2014}+\dfrac{1}{2013}+...+\dfrac{1}{1008}-\dfrac{1}{1007}-\dfrac{1}{1006}-...-1\right)=0\)\(\Leftrightarrow x+2015=0\left(\dfrac{1}{2014}+\dfrac{1}{2013}+...+\dfrac{1}{1008}-\dfrac{1}{1007}-\dfrac{1}{1006}-...-1>0\right)\)\(\Leftrightarrow x=-2015\)
Vậy x=-2015
NT
0
12 tháng 4 2016
A=\(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{2013}-\frac{1}{2014}\)
24 tháng 1 2016
Ax1007x1008=A1= 1007x(1+1/3+...+1/2013)
Bx1007x1008=B1=1008x(1/2+1/4+...+1/2014)
A1-B1=1007x(1-1/2+1/3-1/4+..+1/2013-2/1014) - ( 1/2+1/4+..1/2014)
=1007x(1/2+1/3x4+..1/1007x1008)- (1/2+1/4+..1/2014)
Xet' (1/2+1/4+..1/2014) < (1/2 + 1/2 + .... 1/2) (co' 1007 so' ) = 1007/2
xet' 1007x(1/2 +1/3x4 +... 1/1007x1008 ) > 1007/2
=> A> B
NN
0
21 tháng 6 2022
\(\dfrac{x-3}{2014}+\dfrac{x-7}{2010}=\dfrac{x-1}{1008}+\dfrac{x}{2007}-1\)
\(\Leftrightarrow\left(\dfrac{x-3}{2014}-1\right)+\left(\dfrac{x-7}{2010}-1\right)=\left(\dfrac{x-1}{1008}-2\right)+\left(\dfrac{x}{2007}-1\right)\)
=>x-2017=0
hay x=2017
\(\frac{2014\times1008-1008}{4026+2014\times2013}=\frac{1008\times\left(2014-1\right)}{2013\times2+2014\times2013}=\frac{1008\times2013}{2013\times\left(2+2014\right)}\)
\(=\frac{1008\times2013}{2013\times2016}=\frac{1}{2}\)
Trả lời:
\(\frac{2014\times1008-1008}{4026+2014\times2013}=\frac{1008\times\left(2014-1\right)}{2013\times\left(2+2014\right)}\)
\(=\frac{1008\times2013}{2013\times2016}\)
\(=\frac{1}{2}\)