1 2k≥2.这就是说,当n=k+1时不等式成立.根据①,②知:ak≥2对所有n≥2成立.即an≥2.由递推公式及an≥2,得an+1=(1+ 1 n2+n)an+ 1 2n≤(1+ 1 n2+n+ 1 2n)an(n≥1)两边取对数并利用已知不等式得:lnan+1≤ln(1+ 1 n2+n+ 1 2n)+lnan≤lnan+ 1 n2+n+ 1 2n,故lnan+1-lnan≤...
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所以an=a1+(n-1)d=-2+2(n-1)=2n-4.故答案为2n-4. 分别求出求出f(x-1)和f(x+1)得到a1和a3,然后利用等差中项的概念列式求得x的值,根据数列{an}是公差为正数的等差数列对首项及公差进行取舍,从而求出数列{an}的通项公式. 本题考点:等差数列的通项公式. 考点点评:本题考查了等差数列的通项...
In many cases the lack of an effective, disciplined performance assessment system, combined with minimally required and legally defensible documentation, has often meant that organizations have had only limited success in divesting themselves of their poorer performers without paying large sums of money ...
In some cases, the system stores a snapshot and an associated data structure or index to storage media to create a secondary copy of a volume of data. In some cases, the associated index includes application specific data about a file system or other application that created the data to ...
举报 1、设等差为b则前十项和为10*a1+9b=145,得b=15,a2n=1+(2n-1)*15.2、-27/(-3)=9,则等比的平方为9,即:等比为-3或3;a=1,b=9,c=81(等比为-3)或a=-1,b=-9,c=-81(等比为3).3、(2a+2)*2=a*(3a+3),解得a=-1或-4;按... 解析看不懂?免费查看同类题视频解析查看解答 ...
将下列句子中的错误改正1.Look at a sun.2.My brother buought a umbrella.3.I have an sheep.4.There is cloud in the sky.5.How many a apples are there?6.I usually have a lunch at 12o'xlock7.We have no classes in afternoon.8.BeiJing is a capital
and often I’m the very first person to climb those particular cracks, so it’s like being some sort of an explorer. 通常我是第一个爬上这些特殊裂缝的人,所以这就像探险家。 I climb in a traditional-style, which means that I have specific gear that’s...
所以an=a1+(n-1)d=-2+2(n-1)=2n-4.故答案为2n-4. 分别求出求出f(x-1)和f(x+1)得到a1和a3,然后利用等差中项的概念列式求得x的值,根据数列{an}是公差为正数的等差数列对首项及公差进行取舍,从而求出数列{an}的通项公式. 本题考点:等差数列的通项公式. 考点点评:本题考查了等差数列的通项...
Method for producing an optical element and a preform for precision press moldingPROBLEM TO BE SOLVED: To provide a method for producing a high-quality precision press molding preform from a fluorine-containing glass, especially, a fluorophosphate glass and to provide a method for producing a ...