1 . 证明下列不等式
(1)已知
,
,
,且
,求证:
.
(2)已知
,
,
,求证:
.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751e274e9107d780c39ba9c49d6daefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135125d796a469155fc4a22dc6be3d10.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cad3aaeb5b444feb152378278f68863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5cc7582a7b091b3f0f5a51325e1d0a1.png)
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2 . (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
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3 . 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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4 . 选用恰当的证明方法;解决下列问题.
(1)
为实数,且
,证明:两个一元二次方程
,
中至少有一个方程有两个不相等的实数根.
(2)已知:
,且
,求证:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1476efe1fd8970d815af8a6e62d454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341f6b48e2c616585ed9bd7dbb9c8728.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3ce04492780c4d40fab17aa28d3755.png)
(2)已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c96a416540d6d2c2570c7106f5e0492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03f1c0c0618a585e86afc523bd523e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356bc29ee1bc3f046d9a7b2804c77cf9.png)
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2023-10-14更新
|
98次组卷
|
2卷引用:辽宁省大连市金州区金州高级中学2023-2024学年高一上学期10月月考数学试题
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5 . (1)
为实数,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f25298d03745e6d91799449ed9e96a.png)
(2)用分析法证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f25298d03745e6d91799449ed9e96a.png)
(2)用分析法证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b492c09f576ab6491af4848ce7ecec4.png)
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6 . 证明:
(1)若
,求证:
;
(2)若
,求证:
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae41b4ea7f44a8699f108def4a22ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c79de030dea51c5e80e233b44788de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d2957f2fb09a6caf84dc5a0a8dfead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5673a0c44c18320db28445ac653a0acc.png)
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7 . (1)用向量方法证明:对于任意的
,恒有不等式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0bbac8f3e00fd58c206d93a20a3f92.png)
(2)已知a,b,c均为正实数,且
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3f7da4088c7a6d0ecb32bb1dff53d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0bbac8f3e00fd58c206d93a20a3f92.png)
(2)已知a,b,c均为正实数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751e274e9107d780c39ba9c49d6daefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f917a19a15bceb9a3769e59e25dd9c.png)
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8 . (1)已知
,求证:
;
(2)设
,
,
均为正数,且
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada798eeba5bd19d497bfd0741afd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cba0a3d92a604e519d434ef5af1d12d9.png)
(2)设
![](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/751e274e9107d780c39ba9c49d6daefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09fc94ae8293ad1de55d2990502588e.png)
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2022-10-15更新
|
290次组卷
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2卷引用:河南省信阳市商城县三校联考2022-2023学年高一上学期第一次月考数学试题
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9 . 选用恰当的方法证明下列不等式
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679e658fa5679ce73e1b5fdfe434b724.png)
(2)已知
,证明:
.
(3)已知a,b,c均为正实数,求证:若
,则
.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679e658fa5679ce73e1b5fdfe434b724.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa4f85f4d4f4bd9edaa8a964565ca1a.png)
(3)已知a,b,c均为正实数,求证:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a57e060f61f7efa54982bda67db483a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d54c9eb01acfe09c34cb808326cc5e.png)
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10 . 证明下列不等式
(1)求证:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbbe8678e8336495fe1383b2178ecd8.png)
(2)已知
都是正数,求证:
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70e0db0174a2c05b28fb6d0c2508778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbbe8678e8336495fe1383b2178ecd8.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f14305fe9ecbe4aa54341b2c7574db.png)
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