真题
解题方法
1 . 已知函数
.
(1)若
,则
的定义域是___________ ;
(2)若
在区间
上是减函数,则实数a的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f43b312904eaaed95921a2121468b36a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf87d9d48c3de0a5e9f1a70e51a0bef.png)
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2 . 对于E={
,
,…,
}的子集X={
,
,…,
},定义X的“特征数列”为
,
,…,
,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e5ee0eaeb1b74999cc0a9a9f244545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f21c970d5c427466f9dc79b278003f.png)
=1.其余项均为0,例如子集{
,
}的“特征数列”为0,1,1,0,0,
,0 ,则子集{
,
,
}的“特征数列”的前三项和等于________________ ;若E的子集P的“特征数列”
,
,…,
满足
,
1≤i≤99;E 的子集Q的“特征数列”
,
,…,
满足
=1,
,1≤j≤98,则
的元素个数为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89fe44dab672c37b60f97de0040be87a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8569a9c44c8848428cf81adc03d4151.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da71ee409fbba26c08c826f6137ba6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67813342a0f27a1a3a5804b6b48021a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e4c6544ede4573bd9a07d116f5cfb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e5ee0eaeb1b74999cc0a9a9f244545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f21c970d5c427466f9dc79b278003f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f51f2e6783cd5fd17c4496e966c452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be646cd52d7f2f1714e7542e75810f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b92cba1ed694b1a11411fa274ff7c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5cfb0d2cf24c1da7ba972e0218a974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc1a195f904c8292c2db380466d139f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6268630d5e5288048d32f4aa5c8bc02d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c171ff5c2728e7cf00a88f88de14f308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c02e55edaf83351e20283be2048b0a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6268630d5e5288048d32f4aa5c8bc02d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97479eeeb877265dd63307c9460abd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4afabfd5b4885311f8d9a4bcf791b71.png)
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