若lim (3n^2+5)An=2,且lim (1-n^2)An?
问题描述:
若lim (3n^2+5)An=2,且lim (1-n^2)An?
答
lim (3n^2+5)An=2,
所以
lim (3n^2+5)/(-3)*An=2/(-3)
lim (-n^2-5/3)*An=-2/3
从而
lim (1-n^2)An=-2/3