名校
解题方法
1 . 选用恰当的证明方法,证明下列不等式.
(1)已知
均为正数,且
,求证:
;
(2)已知
,求证:
.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/984faa7ae8bb62ce8157b0b60dc84508.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e10cc5dd849caccce37fe98a26c598.png)
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解题方法
2 . (1)
,其中x,y均为正实数,比较a,b的大小;
(2)证明:已知
,且
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad7ff50e53d35f0c88f9ba8b5ba681d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec33f3dd246b2deec64c7c40b9b2d663.png)
(2)证明:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad7ff50e53d35f0c88f9ba8b5ba681d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882a6e8f86e28c2382ab50e2c8ab0c0c.png)
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解题方法
3 . 设
,
均为正实数.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a964f66da41b8153cfcc6e3f826251.png)
(2)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a964f66da41b8153cfcc6e3f826251.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fcb704303d42780e613d63fd0e1eacf.png)
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解题方法
4 . (1)已知
,求证
;
(2)利用(1)的结论,证明:
(
且
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d100c22435a23e017cfe6f535379d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e793a22eefbb0c5252b15dac42a0769.png)
(2)利用(1)的结论,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb38b30ef5a3de081c41f92ad2992b7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
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名校
解题方法
5 . 已知a,b都是正实数,
(1)试比较
与
的大小,并证明;
(2)当
时,求证:
.
(1)试比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe2b05214c8b22507f0c36b110593d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5106dbdadcc154f73ee91501ae4d43ff.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8a8d68c4616b1e49c6556509a6cf84.png)
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名校
解题方法
6 . (1)已知
克糖水中含有
克糖(
),再添加
克糖
)(假设全部溶解),糖水变甜了.这一事实可以表示为不等式
,证明这个不等式成立.
(2)已知
都是正数,求证
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d100c22435a23e017cfe6f535379d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a3a82d6b1b6ed16c30367f038c16bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2bdea081bcd1c706cc82f906f226ce.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/308b2921746b1ee3f499e220c371ca96.png)
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2023-11-07更新
|
102次组卷
|
2卷引用:新疆乌鲁木齐市实验学校2023-2024学年高一上学期第一次月考数学试题
解题方法
7 . (1)已知
,设
,
,比较
与
的大小;
(2)证明:已知
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec532f119aff0491334d43cf6b1adf70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1166d36cb26ddb11b666ad0faf6a8b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)证明:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a0aa068c979c53361d049ce49987a8.png)
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名校
解题方法
8 . 阅读材料:
(1)下侧图片中为初中化学实验试题,请用数学中不等式知识解释题中“氯化钠加得越多,溶液越咸”这句话,用
代替溶质,
代替溶液,
代替添加的溶质并证明.
(2)结合(1)中的不等式关系与
,
,则有
的不等式性质.解答问题:已知
,
,
是三角形的三边,求证:
.
(1)下侧图片中为初中化学实验试题,请用数学中不等式知识解释题中“氯化钠加得越多,溶液越咸”这句话,用
![](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)
(2)结合(1)中的不等式关系与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf7adcc976209d4b686156120bea276.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e7456f61a8aff7614ca77f6210ba54.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/01721633154e61aa2650bf0b8b10e666.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/2a31b301-f31d-43f1-b62d-80bdc37ca773.png?resizew=216)
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解题方法
9 . 证明下列不等式:
(1)已知
,求证:
;
(2)已知
,求证:
.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9656db3a38e6c58dc5ceb291173053a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829e09e0f8adbcb6ca7e8902019729f6.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc2bb608dcbe043ded3b74d4a8b5140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d2a05075997525049a368aba1c2b46.png)
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名校
解题方法
10 . (1)已知实数
,
满足
,求证:
.
(2)若实数
,
为正数,且满足
,用反证法证明:
和
中至少有一个成立.
![](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/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/838b9f49811c77cbf7d12d3af4a63373.png)
(2)若实数
![](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/4a7dbc702617c765a573961953cc0901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eba1d7973f41f2050afd1759a0e480e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfd31530f4f4d297248c3e39f42d8fb.png)
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