:【1/(√2+1)+1/(√3+√2+1/(√4+√3)+……+1/(√2012+√2011)】(√2012+1)
=(√2-1+√3-√2+√4-√3+……+√2012-√2011)×(√2012+1)
=(√2012-1)(√2012+1)
=2012-1
=2011
:【1/(√2+1)+1/(√3+√2+1/(√4+√3)+……+1/(√2012+√2011)】(√2012+1)
=(√2-1+√3-√2+√4-√3+……+√2012-√2011)×(√2012+1)
=(√2012-1)(√2012+1)
=2012-1
=2011