X x 2011 - X x 1 = 2011 x 2 +2009
X x ( 2011 - 1 ) = 4022 + 2009
X x 2010 = 6031
X = 60312010
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
Xét A=Xx2011-x=Xx(2011-1)=Xx2010
Xét B=2011+2009+2011=6031
\(\Rightarrow\)Xx2010=6031
\(\Rightarrow\)X=3 1phần2010
X x 2011 - X = 2011 + 2009 + 2011
X x ( 2011 - 1 ) = 6031
X x 2010 = 6031
X = 6031 : 2010
X = \(\frac{6031}{2010}\)
