(2010乘2012加1)分之(2011加2011乘2011 )
=[(2011-1)乘(2011+1)加1]分之(2011加2011乘2011)
=(2011乘2011-1+1]分之(2011加2011乘2011)
= (2011乘2011)分之(2011加2011乘2011 )
=1+1/2011
=1又1/2011
(2010乘2012加1)分之(2011加2011乘2011 )
=[(2011-1)乘(2011+1)加1]分之(2011加2011乘2011)
=(2011乘2011-1+1]分之(2011加2011乘2011)
= (2011乘2011)分之(2011加2011乘2011 )
=1+1/2011
=1又1/2011