名校
解题方法
1 . 利用和差化积和积化和差公式完成下面的问题:已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51da9e5d60586f1e09c497b420ea933b.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24a12de9a13f6f9f9b0a896b7555c65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/487a0769ade1e25a23caaa6f8c8e874a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51da9e5d60586f1e09c497b420ea933b.png)
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名校
解题方法
2 . 已知函数
.若存在
使得
是严格增函数,那么称
为“缓降函数”.(本题可以利用以下事实:当
时,
.)
(1)判断以下函数是否是“缓降函数”①
②
(无需写出理由);
(2)求证:
是“缓降函数”;
(3)已知
,求证:
是“缓降函数”的充要条件是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd06c79ae6fc666bf28fef89a45bad2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b9ff3088cf75d2c0723095b849155a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d49ec515fb1fdc93ca4dda443326ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640461197eaf70c0ebe1eb89daf383c1.png)
(1)判断以下函数是否是“缓降函数”①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a018432a8de4afa287edb8fe44893c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac11a6a57971621e4aa220349bc6fba1.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9c4d40c9d00ed13cf8c56984c5b8b4.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be466586da8810ccfd811c59a747adb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82944a9643cc5f97b2b7cc7c6a901c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
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名校
3 . 已知向量
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31f58e1a076ff63b3d88974781edac7.png)
,且
,
,其中
,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c39a715d1b3a985c20aa399f4394514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31f58e1a076ff63b3d88974781edac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7253dfe76f7ed7c33921776bb0e001.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f32595de21ddf175783168ce26d629d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5732b7447972dda107bf1a525aca5ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaa8040b9b8e341d7fda88371d91b0a.png)
A.![]() ![]() ![]() | B.![]() |
C.当![]() ![]() | D.![]() ![]() |
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4 . 已知函数
在区间
上有定义,如果对于任意的
、
,都有
,则称
为上凸函数,若
为上凸函数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad313b1a189a126f35dd714f8faf6785.png)
(
为任意大于
的正整数),①
在
上为上凸函数;②在
中,
;③
为上凸函数;④
(
,
).上述四个命题为真命题的为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f454719abc6d2197b1fc9755d587ea1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1bedaf3854b48806b82b3b804451cf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad313b1a189a126f35dd714f8faf6785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8ededa7c04c318596dc03b370cbedb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7f9b35017daa8b524c5717a355834a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbfe8e7fb253685e0e50bae0c5482314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efbe788cae53f5050cb497e16bae375b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc873fc03e6e4d3c4ba02f8b1147b20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a50e320acf61b31aaba438f4da865a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac69e6db1df13ed64756b4f391ae9fac.png)
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