求lim(n→∞)(2^1/2 * 2^1/4 * 2^1/8 ...2^1/2n)

问题描述:

求lim(n→∞)(2^1/2 * 2^1/4 * 2^1/8 ...2^1/2n)

原式=lim(n→∞)[2^(1/2+1/4+1/8+……+1/2^n)]
=lim(n→∞)[2^(1-1/2^n)]
=2^(1-0)
=2