x . 2011 - x = 2011 . 2009 - 2011

x.(2011 - 1) = 4038088

x . 2010 = 4038088

x = 4038088: 2010

x = 2008,999005

X x 2011-X = 2011 x 2009 - 2011

X x ( 2011-1)   = 2011 x (2009- 1)

X x 2010        = 2011 x 2010

=> X=2011

Tim giá trị biểu thức : A = 1/4+1/12+1/24+1/40+1/60+1/84

x *2011 -x= 2011 * 2009 +2011

=> x*(2011-1)=2011*(2009+1)

=>     x*2010=2011*2010

=>            x=2011

x x 2011 - x = 2011 x 2009 + 2011

x x ( 2011 - 1 ) = 2011 x ( 2009 + 1 )

x x 2010 = 2011 x 2010

x x 2010 = 4042110 : 2010

x             = 2011

505,374285

hk tốt!!

Đ/S = 1011

mình nhầm HK tốt!!!

X x 2011-X=2011x2009+2011

Xx(2011-1)=2011x(2009+1)

Xx2010    = 2011x2010

=> X=2011

x=2011

x * 2011 - x = 2011 x 2009 + 2011

x * ( 2011 - 1 ) = 2011 x ( 2009 + 1 )

x * 2010 = 2011 x 2010

x = 2011

x * 2011 - x = 2011 * 2009 + 2011
x*(2011-1) = 2011*(2009 +1 )
x * 2010 = 2011 * 2010
x= 2011

\(x.2011-x=2011.2009+2011\)

\(\Leftrightarrow2010x=4042100\)

\(\Leftrightarrow x=4042100:2010\)

\(\Leftrightarrow x=\dfrac{4042100}{2010}\)

Vậy ...

x . 2011 - x = 2011 . 2009 + 2011

\(\Rightarrow\) x (2011 - 1) = 2011 (2009 + 1)

\(\Rightarrow\) x . 2010 = 2011 . 2010

\(\Rightarrow\) x = 2011

lấy cả 2 vế trừ đi 3

\(\frac{x-2010-2011}{2009}+\frac{x-2009-2011}{2010}+\frac{x-2009-2010}{2011}=3\)

\(\Leftrightarrow\left(\frac{x-2010-2011}{2009}-1\right)+\left(\frac{x-2009-2011}{2010}-1\right)+\left(\frac{x-2009-2010}{2011}-1\right)=0\)

\(\Leftrightarrow\frac{x-6030}{2009}+\frac{x-6030}{2010}+\frac{x-6030}{2011}=0\)

\(\Leftrightarrow\left(x-6030\right)\left(\frac{1}{2009}+\frac{1}{2010}+\frac{1}{2011}\right)\)

\(\Leftrightarrow x-6030=0\)(vì \(\frac{1}{2009}+\frac{1}{2010}+\frac{1}{2011}>0\))

\(\Leftrightarrow x=6030\)

Vậy ................

X x 2011 - X x 1 = 2011 x 2 +2009

X x ( 2011 - 1 ) = 4022 + 2009

X x 2010 = 6031

      2010

X x 2011 - X = 2011 + 2009 + 2011

X x ( 2011 - 1 ) = 2011 x ( 2009 + 1 )

X x 2010 = 2011 x 2010 

X = 2011

x * 2011 - x = 2011 + 2009 + 2011

x * ( 2011 - 1 ) = 2011 * ( 2009 + 1 )

x * 2010 = 2011 x 2010

x = 2011

`(2011xx2020-1)/(2009xx2011+2010)`

`=((2009+1)xx2011-1)/(2009xx2011+2010)`

`=(2009xx2011+2011-1)/(2009xx2011+2010)`

`=(2009xx2011+2010)/(2009xx2011+2010)`

`=1`

\(\dfrac{2011.2010-1}{2009.2011+2010}\) 

= \(\dfrac{2011.2009+2011-1}{2009.2011+2010}\) 

= \(\dfrac{2011.2009+2010}{2009.2011+2010}\) 

= 1