(1)已知
,
都是正数,且
,求证:
;
(2)已知
,求证:
.
![](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/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e44a6abb0974fa7a3ff0477c4e891e0.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/563a46b2a899fc2f4402f3bf9f92fa47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d52cbbc1bc35457ec89dac79fbb4813.png)
18-19高二上·贵州铜仁·期末 查看更多[4]
【全国百强校】贵州省铜仁市第一中学2018-2019学年高二上学期期末考试数学(文科)试题(已下线)2019年3月24日 《每日一题》理数选修2-2-每周一测(已下线)2019年4月9日 《每日一题》理数选修2-2(期中复习)-直接证明与间接证明(已下线)2019年4月14日 《每日一题》文数选修1-2(期中复习)-每周一测
更新时间:2019-01-24 09:55:01
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适中
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【推荐1】(1)已知
,试用分析法证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b1411bbc505b5056e68e077d18e06b.png)
(2)等差数列
中,已知
,试求n的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6c5526947e9bef051bc3bdf7fd186d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b1411bbc505b5056e68e077d18e06b.png)
(2)等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342ead1007636d0f9aed521b7bc73779.png)
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解答题-证明题
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名校
【推荐2】已知
的三边长分别为
、
、
,且其中任意两边长均不相等,若
、
、
成等差数列.
(1)证明
;
(2)求证:角
不可能是钝角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/a2c70fcaa661df4fbcad820b439accda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9237dbe3a4f28962ef2870b4e7dab599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26302e47e2926b0e807952b0efe7463.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128c02c6fe7314fad4dd3b4a9da8a817.png)
(2)求证:角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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适中
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【推荐1】设不等式
的解集是
,
,
.
(Ⅰ)试比较
与
的大小;
(Ⅱ)设
表示数集
中的最大数,
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70be21d700725c712cd7a0f489480c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab92728b35ed5798e07a2b0095bfcc1.png)
(Ⅰ)试比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdaba8b1591046933f2f725b6b1bff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74dec63e6d30a41fcc8972397875bf46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0d92ce18fccd917d89f9bbc2cfad5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
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【推荐2】已知二次函数
(
、
、
均为实常数,
)的最小值是0,函数
的零点是
和
,函数
满足
,其中
,为常数.
(1)已知实数
、
满足、
,且
,试比较
与
的大小关系,并说明理由;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/331d5e308cd5469e0f28a8d75f79903f.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/13d46a0b30bc7b90a38ce21bca97a4ad.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4f277d11a202093539883ffeae4445.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e420fa6b63494d0f4e9591158a9a19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
(1)已知实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4bd621648ec149b3ea206ff2acc5264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b02d1725ecfb1b08b26203a475c1e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f0427915ac19bd2f9383d079b2a063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1f6718b4be26dd3274eddbbdf7dd29.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f97ff0489790f1f8a6b4b395092fb4.png)
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