名校
解题方法
1 . 设数列
的前
项和为
.已知
,
,
.
(1)求证:数列
是等比数列;
(2)若数列
满足
,且
的前
项和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315b41eeea0dbaa395af2474c4ba6acb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b03dd47b0469396a7a7aeae1c31eb5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521a229c1860ab8311adc47d1658265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26d8dd318fdd7ce26d6a8a54508cd03.png)
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名校
解题方法
2 . 某算法的程序框图如图所示,若
,
,且
,
,
,则输出的结果是( )
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421473388109824/2422775689388032/STEM/b8be782f-0f0d-4632-bb59-45bf4db9ad9f.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66eba129d92ede31b728e2590c4db2a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73552080b72be89317eb60e9bef76c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93f55c7fdbe3a71ff84e5e192e6206e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f750ca0790311115e5322fdd7b2d0fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8675ee91d0a38e1654a55b09889edcf2.png)
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421473388109824/2422775689388032/STEM/b8be782f-0f0d-4632-bb59-45bf4db9ad9f.png?resizew=159)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
3 . 已知函数f(x)=x2﹣2ax+3,g(x)=|ax﹣2|+|x+2|.
(1)当a=1时,求不等式f(x)≥g(x)的解集;
(2)设a>1,且当x∈[2,3]时,f(x)≤g(x)﹣9,求实数a的取值范围.
(1)当a=1时,求不等式f(x)≥g(x)的解集;
(2)设a>1,且当x∈[2,3]时,f(x)≤g(x)﹣9,求实数a的取值范围.
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4 . 已知数列{an}的前n项和为Sn,且a1=1,an+1=λSn+3λ2﹣2λ,n∈N*.
(1)当
时,求an;
(2)是否存在实数λ,使得数列{an}是递增的等比数列,若存在,求出实数λ的取值范围,若不存在,请说明理由.
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8da022b26812ea653c7ed00cb1fb448.png)
(2)是否存在实数λ,使得数列{an}是递增的等比数列,若存在,求出实数λ的取值范围,若不存在,请说明理由.
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5 . 在△ABC中,角A,B,C的对边分别为a,b,c,且满足2asin(C
)=b+c.
(1)求角A的大小;
(2)若∠BAC的平分线交边BC于点D,且AD
,求△ABC的面积S的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb7e4140509c3f5e185935291bf5c7e.png)
(1)求角A的大小;
(2)若∠BAC的平分线交边BC于点D,且AD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e589def3e7fe21b601bc6d5144073202.png)
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6 . 已知实数x,y满足
,则向量
在向量
方向上的投影的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260e1d1d059cde083d2d6fc4d05ae65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c099ae006fe651453b301454bdc0999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683e56c442070157a69462a375ec4387.png)
A.﹣12 | B.﹣10 | C.﹣2 | D.2 |
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7 . 设数列{an}是递减等比数列,且a4a5a6=512,a4+a5+a6=28,则数列{log2an}的前n项和Sn取得最大值时的n的值为( )
A.7 或 8 | B.8 或 9 | C.7 | D.28 |
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名校
解题方法
8 . 在
中,
,
,
为角
,
,
所对的边,点
为
的重心,若
,则
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5bd41bdc0cbe99b030681f12d7bd56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5201fc26d013f6fb889933c0e32f5c53.png)
您最近一年使用:0次
2020-03-09更新
|
465次组卷
|
3卷引用:湖北省仙桃中学2018-2019学年高三上学期期中数学(理)试题
名校
9 . 如图,在四边形
中,
,
,
,且
,
,
,
四点共圆.
![](https://img.xkw.com/dksih/QBM/2020/3/5/2413215531057152/2413694817206272/STEM/db8b37d4bef04681865dc94217fb1f7a.png?resizew=199)
(1)求
的长;
(2)求四边形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01a9b6adb4dbff18763106f37fa71c92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a62bb8cfe72837b1a77851589000976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2020/3/5/2413215531057152/2413694817206272/STEM/db8b37d4bef04681865dc94217fb1f7a.png?resizew=199)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2020-03-06更新
|
482次组卷
|
2卷引用:2018届湖北省荆州市沙市中学高三5月高考冲刺第一次模拟考试数学(文)试题