解:原式=1/2*3/2*2/3*4/3*3/4*5/4......*2010/2011*2012/2011
=1/2*2012/2011
=1006/2011
(1-1/2^2)(1-1/3^2)(1-1/4^2)…(1-1/2011^2)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4)…(1-1/2011)(1+1/2011)
=1/2×3/2×2/3×4/3×3/4×5/4…2010/2011×2012/2011
=1/2×2012/2011
=1006/2011。