已知正数数列{an}的前n项和为Sn,满足Sn2=a13+a23+…+an3.( 发布时间:2017-04-27 09:18 │ 来源:www.tikuol.com 题型:解答题 问题: 已知正数数列{an}的前n项和为Sn,满足Sn2=a13+a23+…+an3.(I)求证:数列{an}为等差数列,并求出通项公式;(II)设bn=(1-1an)2-a(1-1an),若bn+1>bn对任意n∈N*恒成立,求实数a的取值范围.
题型:解答题 阅读短文,判断下列句子正(T)误(F)。 Tom is a very clever boy. He studies in Yucai School. He is tall and thin. But his classmate, Lili, is taller than him. Lili is active and beautiful. They all love their English teacher. They work hard. ( ) 1. Tom is taller than Lili. ( ) 2. Tom is very clever. ( ) 3. They don't love their English teacher. ( ) 4. Lili is active and beautiful. ( ) 5. Tom is fat and tall. 查看答案
题型:解答题 —— Why do you make me do so? —— I am sorry that you________do such a thing. A.wouldB.canC.shouldD.may 查看答案
题型:解答题 8岁男性,左眼突,运动障碍2个月。CT示视神经呈梭形增粗,视交叉增粗,中度、均匀强化。最可能的诊断是A.视网膜母细胞瘤B.视神经脑膜瘤C.视神经胶质瘤D.海绵状血管瘤E.黑色素瘤 查看答案