2017-2018高三数学二轮同步训练:等差数列

适用年级:高三
试卷号:588415

试卷类型:专题练习
试卷考试时间:2018/1/12

1.单选题(共8题)

1.
(2017·邯郸月考)等差数列{an}的前n项和记为Sn,三个不同的点ABC在直线l上,点O在直线l外,且满足,那么S13的值为(  )
A.B.
C.D.
2.
在等差数列{an}中,若a4a6a8a10a12=120,则2a10a12的值为(  )
A.20B.22
C.24D.28
3.
设等差数列{an}的前n项和为Sn,若a1=-11,a4a6=-6,则当Sn取最小值时,n等于( )
A.6B.7C.8D.9
4.
已知{an}满足a1a2=1,,则a6a5的值为(  )
A.48B.96
C.120D.130
5.
在等差数列{an}中,a1=-2 015,其前n项和为Sn,若,则S2017的值等于(  )
A.2 016B.-2 016
C.2 017D.-2 017
6.
(2016·遵义联考一)已知数列{an}是公差为d的等差数列,a2=2,a1·a2·a3=6,则d等于(  )
A.1B.-1
C.±1D.2
7.
(2016·云南玉溪一中月考)已知函数,函数g(x)=f(x)-x+1的零点按从小到大的顺序排列成一个数列,该数列的前n项的和为Sn,则S10等于(  )
A.45B.55
C.210-1D.29-1
8.
已知Sn是等差数列{an}的前n项和,若a7=9a3,则等于(  )
A.9B.5
C.D.

2.选择题(共1题)

9.

阅读下面短文,用括号内所给动词的适当形式填空。(必要时可加情态动词或助动词)
   Once there was a baby eagle {#blank#}1{#/blank#} (live) in a nest on a cliff(山崖). The baby eagle loved his nest. It was warm, soft and comfortable. And even better, he had all the food and love that his mother could give. Whenever the baby eagle was hungry, his mother would always come just in time with the delicious food he liked.
   He {#blank#}2{#/blank#}  (grow) happily day after day. But suddenly his world changed. His mother stopped {#blank#}3{#/blank#}  (come) to the nest. He was full of sadness and fear. He thought he{#blank#}4{#/blank#}  (die) soon. He cried, but nobody heard him.
   Two days later his mother appeared with some nice food. The baby eagle was wild with joy. But his mother {#blank#}5{#/blank#}  (put) the food at the top of the mountain and then looked down at her baby. The baby eagle cried out. “Mum, why did you do this to me? I’m hungry. Don’t you know I will die if I have nothing {#blank#}6{#/blank#} (eat)?”
   “Here{#blank#}7{#/blank#} (be) the last meal I give you. Come and get it by yourself, ”his mother said. Then she flew down and pushed the baby eagle out of the nest.
   The baby eagle {#blank#}8{#/blank#} (fall) down, faster and faster. He looked up at his mum, “Why do you abandon me?” He looked down at the earth. The ground was much closer. Then something strange happened. The air caught behind his arms and he began{#blank#}9{#/blank#} (fly)! He wasn’t moving to the ground any more. Instead, his eyes were pointed up at the sun.
   “You{#blank#}10{#/blank#} ( fly)! You can make it!” His mother smiled.

3.填空题(共3题)

10.
设函数,利用课本中推导等差数列前项和公式的方法,可求得_______________
11.
设Sn是等差数列{an}的前n项和,若,则   
12.
(2016·铁岭模拟)已知数列{an}的前n项和Snn2-6n,则{|an|}的前n项和Tn=________________.
试卷分析
  • 【1】题量占比

    单选题:(8道)

    选择题:(1道)

    填空题:(3道)

  • 【2】:难度分析

    1星难题:0

    2星难题:0

    3星难题:0

    4星难题:0

    5星难题:0

    6星难题:0

    7星难题:0

    8星难题:0

    9星难题:11