帮我求下n- >无穷,e^(1/n)+e^(2/n)+e^(3/n)+e^(4/n)+…e的极限,说的详细些,还有n- >无穷,(1/n)*[e^(1/n)+e^(2/n)+e^(3/n)+e^(4/n)+…e]的极限,请说的详细些