/ab-2/+(b-1)的平方=0,b-1=0 b=1ab-2=0 a=2ab分之1+(a+1)(b+1)分之1+(a+2)(b+2)分之1+……+(a+2010)(b+2010)分之1=1/1x2+1/2x3+1/3x4+1/4x5+……1/2011x2012=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/2011-1/2012=1-1/...