1:1  08-24[数学]丁老师教你巧妙解答数列求和问题
讲解人：丁益祥，全国著名数学特级教师，北京市陈经纶中学教学组组长，首席数学教师。推荐理由：数列求多项式和找不到切入点？丁老师教你根据递推关系的结构形式，做个别实验，分析探求出数列的本质特点，迅速解决问题。 题面：（来源:2012全国课标卷） 数列{an}满足an+1+(-1)^n*an=2n-1，则{an}的前60项和为（ ）． A．3690 B．3660 C．1845 D．1830 本部分内容设定了隐藏,需要回复后才能看到
 跟帖分享你的答案，即刻看到正确答案和解析！
这道题的解答思路非常巧妙，需要同学们具备足够的抽象概括能力。你成功做出了吗？
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沙发#
发布于：2012-08-23 17:46
a
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板凳#
发布于：2012-08-23 22:20
{an}的前60项和为（
{an}的前60项和为3660. |
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地板#
发布于：2012-08-23 22:48
.....
.................... |
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4楼#
发布于：2012-08-24 09:23
我算出来了，答案选 D
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5楼#
发布于：2012-08-24 10:41
60项结果答案为
D |
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6楼#
发布于：2012-08-24 12:13
121
看看吧~~~~~~~~~~~~~~~~~~~~~~~~~ |
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7楼#
发布于：2012-08-24 17:18
D
选D 对吗？？？好期待 |
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好好好 |
9楼#
发布于：2012-08-24 17:38
d d
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