x=[-1±√(1+4*2010)]/2=（-1±√8041）/2 设a=（-1+√8041）/2,b=（-1-√8041）/2 a^2+2a+b=2009+2√8041 设a=（-1-√8041）/2,b=（-1+√8041）/2 a^2+2a+b=2009