题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-76008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-69611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-87007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-10870.png)
(1) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-76008.png)
(2) 若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-82739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-77978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-33901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-94896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233045-95594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233045-85609.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233045-92818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233045-86433.png)
解析
试题分析:(1) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-76008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233046-72328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-69611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-87007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-10870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233046-52476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233046-33432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233043-76008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-94896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233045-95594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233045-85609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-94896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-82739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-77978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-33901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-82739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233046-67881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233047-68239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233044-94896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233045-95594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233045-85609.png)
试题解析:(1) 设等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233047-84772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233047-75133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233047-11126.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233046-52476.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233046-33432.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233045-92818.png)
(2) 由
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233048-24188.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233048-81227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233048-30489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233048-29291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233049-42507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233049-60613.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233046-67881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233049-41343.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233049-74359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233049-92687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233050-91471.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233027-25492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233027-38183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233028-84607.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233027-25492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233028-41174.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233028-28844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233028-74954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233029-88746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233029-39140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233029-85923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233012-95004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233012-94047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233013-57977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233013-32225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233013-78168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233004-12797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233004-43351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233004-31923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233005-69906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011233005-98041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011232947-49707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011232947-28649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011232947-52574.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011232937-59504.png)
A.1 | B.![]() | C.-2 | D.3 |
最新试题
- 1 Last Saturday, Tonny went to see Benny.But he didn’t kn
- 2“If you want to see a thing well, reach out and touch it!”Th
- 3如图是五角星,已知AC=a,求五角星外接圆的直径(结果用含三角函数的式子表示).
- 4.函数的图象如图所示,则______________,__________.
- 5下列关于拉丁美洲独立革命的叙述,不正确的是[ ]A.1822年,西班牙王子佩德罗宣布巴西获得独立B.玻利瓦尔和圣
- 6—I see you got a "D" in biology._ ?—Well, I found th
- 7已知(2r+4)2+|9-3s|=0,则rs=( )。
- 8仔细观察下图:
- 9Only when the government increases affordable homes for low-
- 10设α为第四象限角,则下列函数值一定是负值的是________.①tan ②sin ③cos ④cos
热门考点
- 1一物体做匀加速直线运动,初速度为0.5m/s,第7s内的位移比第5s内的位移多4m,求:(1)物体加速度a 的大小;(2
- 2蜻蜓、蜈蚣和蜘蛛都是自然界中常见的昆虫.______.
- 3关于磁感线和磁场的认识,正确的是A.一金属棒靠近小磁针时被吸引,则该金属棒有磁性B.铜棒和铁棒都可以被磁体磁化C.磁感线
- 4关于x的方程2x2+3x=0的两个根分别为m和n,则m2n+mn2=______.
- 5若A={θ|cosθ=12,θ∈(-2π,2π)},则集合A的子集有 ______个.
- 6如图所示,在△ABC中,D、E分别为AB、AC的中点,延长DE到F,使EF=DE,若AB=10,BC=8,则四边形BCF
- 7AB是⊙O的弦,∠AOB=80°,则弦AB所对的圆周角是( )A.40°B.140°或40°C.20°D.20°或16
- 8There was enough evidence to prove that the explosion in Rob
- 92010年1月8日,中共中央政治局就世界主要国家财税体制和深化我国财税体制改革进行第十八次集体学习。胡锦涛在会上强调,各
- 10对方程(其中是自然对数的底数,)根的描述正确的是( )A.对任意的实数,方程必有根B.对任意的实数,方程均无根C.必