1.
已知数列\(\{a_{n}\}\)满足\(a_{n}= \dfrac {n}{t+1}(n,t∈N*,t\geqslant 3,n\leqslant t)\).
证明:
\((I)a_{n} < e\;^{a_{n}-1}(e\)为自然对数底数\()\);
\((\)Ⅱ\() \dfrac {1}{a_{1}}+ \dfrac {1}{a_{2}}+…+ \dfrac {1}{a_{n}} > (t+1)\ln (n+1)\);
\((\)Ⅲ\()(a_{1})^{t}+(a_{2})^{t}+(a_{3})^{t}+…+(a_{n})^{t} < 1\).