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1 . 已知xy=2x+y+2(x>1),则x+y的最小值为________ .
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2016-12-05更新
|
900次组卷
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4卷引用:2016-2017学年江苏省盐城市龙冈中学高二上学期调研考试数学试卷
解题方法
2 . 若2x﹣y+1≥0,2x+y≥0,且x≤1,则z=x+3y的最小值为________ .
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3 . 已知x<0,则
的最大值等于________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6a5ccfecce0ddaa183fe2cad7f53ca.png)
您最近一年使用:0次
2016-12-05更新
|
953次组卷
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2卷引用:2016-2017学年江苏省盐城市龙冈中学高二上学期调研考试数学试卷
4 . 若点P(a,3)在不等式2x+y<3表示的区域内,则实数a的取值范围是________ .
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5 . 设
是公比为正整数的等比数列,
是等差数列,且
,
,
.
(1)求数列
和
的通项公式;
(2)设
数列
的前
项和为
.
①试求最小的正整数
,使得当
时,都有
成立;
②是否存在正整数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
,使得
成立?若存在,请求出所有满足条件的
;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3ef03d10877e8ef1292eb3312617ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b0763341ea9a373d9d5920714d4a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307b9116e736015d18c1cfe102aee8d9.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99518f28e9a7e4219d9c757ac84ad3b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82537b0d1efd8f5ef044bfdd1d7a224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
①试求最小的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7e9f86738335a22298559db41037a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db620841e1bba045cdfca776ebda1b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b0952277ad01fbf5fba174fdd9709e.png)
②是否存在正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32b5e30fd8559013ccfad0419279df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31fa241aa355a70708f6caaee10de675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
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6 . 在数列
中,设
(
,
,
),
,则满足
的
的值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6d72a05039739b1052ec14454ef47df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00725492cf521a4277f03c364998a4cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cfd17b8fd6dbb729a271a866c0ecbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0c73a1455fc61a2239cb62de1f3c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4274cf796b57e95f04ef33f0532a33f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a340495afc00f71be3e8a236c477ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
您最近一年使用:0次
解题方法
7 . 在
中,设角
所对的边分别为
,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/842f25e1c2f443b33d841e8983107ad6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d723d5a98d95191ff84702526e922e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
您最近一年使用:0次
2016-12-04更新
|
577次组卷
|
2卷引用:2015-2016学年江苏盐城市高一下学期期末数学试卷
8 . 设
是等比数列,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5905a1755bf66784021797d628751c.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd204617a6a3c6308f59359d8bfd65e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b932ddacaf5235694da0d7313cbcf65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5905a1755bf66784021797d628751c.png)
您最近一年使用:0次
9 . 已知等差数列
的前
项和为
,则其公差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
_______ .
![](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/755795773995c9e8422f4fbe0fdf61d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
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10 . (选修4—5:不等式选讲)
已知正数
满足
,求
的最小值.
已知正数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09568754a8422dd90e9cb040b4c70544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f349e1e9177a11dc102c6ce9d3e01.png)
您最近一年使用:0次