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共找到 5161 与an=A 相关的结果,耗时67 ms
设an=1+1/2+1/3+.+1/(3n-1)则a(n+1)-an=
数学
(2014•河南一模)已知等比数列{an}的公比为q,则“0<q<1”是“{an}为递减数列”的()A.充分不必要条件B.必要不充分条件C.充要条件D.既不充分也不必要条件
其他
1、在等差数列{an}中,a3、a9是方程2x^2-x-7=0的两个根,则a6=( )2、如果不等式组x^2-2x-3<0,x-a>0的解集不是空集,实数a的取值范围是( )3、△ABC的内角A,B,C的对边分别为a,b,c,若a,b,c成等比数列,且c=2a
数学
B=( )
a1=2 a(n+1)=an+3n 求通项公式在数列{an}中,a1=2,a(n+1)=an+3n,求通项公式
其他
情景对话.1.Why do you like spring?( )2.Which month does Mike like best?( )3.What do you usually do on Saturday?( )4:What"s Zoom doing?( )A
英语
He's sending G
the man sat there happily for an hour and a halo and drank翻译
英语
she is British还是she is a Britishshe is an English还是she is English chinese前面可不可以加a?这类问题可不可以细讲?
语文
英语选择,说明理由:The Blacks live in () small town.A.a B.an C.the D./
其他
to analyse the grammar of a sentence,plzi saw a news headline"58-year-old is first non-government official to lead soe regulatory body
英语
in chinadaily
On being told by an assistant that the dress was sold,the woman returned the following morning字数有限,接着是dressed in a fur coat.那么,dressed
英语
in a fur coat为
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