求证下列问题:
(1)已知
均为正数,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c7b02d78a23b27f99a292938af3cca.png)
.
(2)已知
,求证:
的充要条件是
.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333de134fb62d12d1b62f59bab55fbfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c7b02d78a23b27f99a292938af3cca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d2761fb3463043acfb4c58ae13b9c9.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600b831a379de50ef6ac996243c9b4ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e968983b6b76e7618ad04919ec485a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d035fd92184fb215da52254d57b9b2.png)
更新时间:2022-10-24 20:05:15
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【推荐1】已知
都是正数.求证:“
”的充要条件是“
”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e2be3e9225c71609248299caa49432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c79de030dea51c5e80e233b44788de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
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适中
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【推荐2】已知关于x的方程
有一个根为
.
(1)求证:方程
有一个根为
的充要条件是
;
(2)若
,解关于x的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
(1)求证:方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c766352f0be38b719621052de92615bd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f84617aaab200384efeaec9a4fe71772.png)
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适中
(0.65)
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【推荐1】已知数列
,其前n项和
满足
.
(1)求证:数列
为等差数列;
(2)若
,数列
满足
,
,
,记
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的前n项和,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec87ad121ff72a3b8f0e266820315f8.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aaee408bdec05bbdfcd4b841a331e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad65d45aa15a5eee838df9cd31c68ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd78c6771e53712d5d7965077c4964a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38ba43826135367d798e714aba0f014.png)
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解答题-问答题
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【推荐2】已知a>0,函数
,设x1>0,记曲线y=f(x)在点(x1,f(x1))处的切线为l.
(1)求l的方程;
(2)设l与x轴交点为(x2,0)证明:
①
;
②若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4753bd26a60cd38f2d65edcd3c7a0e.png)
(1)求l的方程;
(2)设l与x轴交点为(x2,0)证明:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37ca83d51488ea2896f8348a626b705.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59fcaf9df58c979c73732ad5479e5e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0de268b006b96ceba6298511cb0bdb3.png)
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(0.65)
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【推荐2】已知函数
.
(1)证明:当
时,
;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015c6fa35b605855fb6fff14566e2fb7.png)
(1)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c68fc648bc6e80c383a8787fbb49a4.png)
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【推荐2】选修4-5:不等式选讲
(Ⅰ)求函数
的最大值
.
(Ⅱ)若实数
满足
,证明:
,并说明取等条件.
(Ⅰ)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d731064038cd79675eee464ab294232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(Ⅱ)若实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e25ff2a6f663de678d31d6a0d48dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2b1d72928a547268f28898f9a66428.png)
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