原式=[(2^2-1^2)/2^2]*[(3^2-1^2)/3^2]*...*[(2011^2-1^2)/2011^2]
=[(1*3)/2^2]*[(2*4)/3^2]*...*[(2010*2012)/2011^2]
=(1/2)*(2012/2011)
=1006/2011
原式=[(2^2-1^2)/2^2]*[(3^2-1^2)/3^2]*...*[(2011^2-1^2)/2011^2]
=[(1*3)/2^2]*[(2*4)/3^2]*...*[(2010*2012)/2011^2]
=(1/2)*(2012/2011)
=1006/2011