limx→3(1x−3−3x2−3x)
=limx→3(1x−3−3x(x−3))
=limx→3(x−3x(x−3))
=limx→3(1x)
=13
limx→3(1x−3−2x2−4x+3)
limx→∞(5x2+x+3x2+x+3)1x (2002)