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解题方法
1 . (1)已知:
、
、
,求证
;
(2)已知:
、
、
,且
.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/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f1451a066c4b2a1fd0d9bbbf61954d.png)
(2)已知:
![](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/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751e274e9107d780c39ba9c49d6daefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135125d796a469155fc4a22dc6be3d10.png)
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2 . 已知a,b均为正实数,且
.
(1)求
的最大值;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b40b1544e62be8b9e9f4dc9f2c0c74.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438dff4764605c96d152afd661f89804.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c73593af98298c581995ba919ae3667.png)
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3 . 若a,b是大于0的常数,x,y∈(0,+∞).
(1)求证:(
+
)(x+y)≥(a+b)2(当且仅当ay=bx时等号成立).
(2)求函数f(x)=
+
(0<x<1)的最小值,并求此时x的值.
(1)求证:(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03be96789499141b29712e200f0997bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7871957980034e796acd90b4b6f66b38.png)
(2)求函数f(x)=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf35027e76f8ea593f82023973d4aba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5e0373be0146d9b5fadd7cdb264825.png)
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4 . (1)已知正数a,b,
,满足
,求证
.
(2)若
时,不等式
恒成立,求实数a的取值范围.
![](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/c6378bad81af67364ba6ecd8b52196e6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c31c1e80d9d0033050e83f93e19feb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feca08ca3e94335cb550e23e162a2566.png)
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5 . (1)解不等式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed75a3b2022d7b23b2bf51c82c0b7b58.png)
(2)设a,b,c均为正数,且
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed75a3b2022d7b23b2bf51c82c0b7b58.png)
(2)设a,b,c均为正数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751e274e9107d780c39ba9c49d6daefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a3cfe361051dc5e9a3a36b2818db0.png)
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6 . 设
,则下列不等式中一定成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 下列不等式中,恒成立的有( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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8 . 设
的内角
、
、
所对的边长分别为
、
、
,则下列命题
①若
,则
;
②若
,则
;
③若
,则
;
④若
,则
;
中,真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b489ff67a08117de227196cb06fb6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0f39cea42e18acc3262a27dded6eee.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43184f7ceeae86327c4cb65ea4fd68e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0606a2a032baf8660be0e77bbb2032a8.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc38d888741a1b2e95fe0773a48c38.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/166f792a201a8ff4a7c73aa5ec3aa026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d64704f065e0ffa415f6c8266ab87c.png)
中,真命题的个数是( )
A.![]() | B.![]() | C.![]() | D.![]() |
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河南省信阳市2021-2022学年高三上学期第一次教学质量检测数学(理)试题河南省信阳市2021-2022学年高三上学期第一次教学质量检测数学(文)试题黑龙江省牡丹江市第一高级中学2021-2022学年高三上学期期中数学(理)试题(已下线)专题13 三角函数与三角恒等变换-2022年高考数学一轮复习小题多维练(新高考版)(已下线)考点18 正弦定理与余弦定理-备战2022年高考数学典型试题解读与变式
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9 . 下列选项中正确的有( )
A.不等式![]() | B.![]() ![]() |
C.![]() | D.存在a,使得不等式![]() |
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解题方法
10 . 已知
、
、
、
均为正实数.
(1)求证:
;
(2)若
,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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c184edd63472d8ddf96e5f815515d929.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42b782fcaa541e3d97d5c6c9513ffbf7.png)
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