Older male mentors: Outcomes and perspectives of an intergenerational mentoring program for young adult males with intellectual disability However, there is little, if any, Australian research concerning the benefits for older mentors involved in such mentoring. The current study aims to ... N Mahoney...
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...
已知等比数列{an}的首项a1>0,公比q>-1,q≠0,设数列{bn}的通项公式bn=an+1+an+2(n∈N*),数列{an},{bn}的前n项和分别记为An,Bn,试比较An与Bn的大小. 查看答案和解析>> 科目:高中数学 来源: 题型: (2008•上海模拟)已知等比数列{an}的首项a1=1,公比为x(x>0),其前n项和为Sn.(1)求...
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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