【单选题】He ran into a passing car duo to _______ .
B.
he ran from the roadside
D.
him to run from the roadside
【简答题】已知数列{a n }中,a 1 =2,a n+1 =4a n ﹣3n+1,n∈N*,已知数列b n =a n ﹣n,证明:数列{b n }是等比数列.
【单选题】已知数列{a n }满足a n =2 2n-1 ,则( )
【单选题】The question “How fast did he drive when he ran the red light?"_____ He ran the red light",。
【单选题】学术批判的目的不在于(),而在于确保研究经得起严格的检验。
【单选题】自 2016 年国家全面放开二胎以来,正推动婴幼儿产业发展,请问这种创业机会来源是
【简答题】已知S n 为等比数列{a n }的前n项和,a 1 =2,若数列{1+a n }也是等比数列,则S n 等于( ) A.2n B.3n C.2 n+1 -2 D.3 n -1
【单选题】以下不属于excel2010中的算术运算符的是()
【简答题】He ______ (惊慌) and ran as fast as he could.
【简答题】已知命题:“若数列{a n }是等比数列,且a n >0,则数列 b n = n a 1 a 2 … a n (n∈ N * ) 也是等比数列”.类比这一性质,你能得到关于等差数列的一个什么性质?并证明你的结论.