a, X x 2013 - X =2013 × 2011 + 2013
X × ( 2013 - 1 ) = 2013 × (2011 +1 )
X × 2012 = 2013 ×2012
X × 2012 =4050156
X=4050156:2012
X=2013
Vậy x=2013
X x 2013 - x = 2013 x 2011 + 2013
2013 x - x = 2013 x 2011 + 2013
2012x = 2013 x ( 2011 + 1 )
2012 x = 2013 x 2012
x = 2013
Tìm X:
a, X x 2013 - X = 2013 x 2011 + 2013
X x 2013 - X x 1 = 2013 x 2011 + 2013 x 1
X x ( 2013 - 1 ) = 2013 x ( 2011 + 1 )
X x 2012 = 2013 x 2012
\(\Leftrightarrow\) X = 2013
