解题方法
1 . 若存在常数
,使得对任意
,
,均有
,则称
为有界集合,同时称
为集合
的上界.
(1)设
,
,试判断
是否为有界集合,并说明理由;
(2)已知常数
,若函数
为有界集合,求集合
的上界
最小值
.
(3)已知函数
,记
,
,
,
,求使得集合
为有界集合时
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd2491dc0189bacbcb09d74ee95e9b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e53000c7d332ec7583f9b3507eb8ace.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53855d56382110218bc98b235a5a971f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5a297689c23bc4a57a888c53ba3b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
(2)已知常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e8f57aad6fb5182c7c87607b007af4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0058182e412897c5f51e8360a43c0c.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11faddee6367704372ce35792f2a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ab7bb40f58f28c9799b20f91d15d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dc2918652a71ff4f1f8455c7f36af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a40142c84be68ee2918c3a8303388c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e0768458378541844f151df19246df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
您最近一年使用:0次
名校
2 . (文)市场上有一种新型的强力洗衣液,特点是去污速度快,已知每投放![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
个单位的洗衣液在一定量水的洗衣机中,它在水中释放的浓度
(克/升)随着时间
(分钟)变化的函数关系式近似为
,其中
,若多次投放,则某一时刻水中的洗衣液浓度为每次投放的洗衣液在相应时刻所释放的浓度之和,根据经验,当水中洗衣液的浓度不低于4(克/升)时,它才能起到有效去污的作用.
(1)若只投放一次4个单位的洗衣液,则有效去污时间可达几分钟?
(2)若第一次投放2个单位的洗衣液,6分钟后再投放2个单位的洗衣液,问能否使接下来的4分钟内持续有效去污?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af923faaf3ae5f5b6c29070bb9952076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92dad40263fc3a1bb171af5b27ebf75b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e247d1c8d645f218870b5d1d7e0eef92.png)
(1)若只投放一次4个单位的洗衣液,则有效去污时间可达几分钟?
(2)若第一次投放2个单位的洗衣液,6分钟后再投放2个单位的洗衣液,问能否使接下来的4分钟内持续有效去污?说明理由.
您最近一年使用:0次
2020-02-29更新
|
1048次组卷
|
6卷引用:上海市十校2016届高三下学期3月联考(文理)数学试题
19-20高一上·上海浦东新·期末
名校
3 . 已知函数
,其中
,
是非空数集且
.设
,
.
(1)若
,
,求
;
(2)是否存在实数
,使得
,且
?若存在,求出所有满足条件的
;若不存在,说明理由;
(3)若
且
,
,
单调递增,求集合
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228d39bd253b6309490b993bf2c546dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5eb03e97d9498bff9c3dfac271dad01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910a5a38ad76a3956d4fbb60018f5537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce46b6c06abe5d56b7e19f67363faa1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e524dec634a5e8db780f68fa1c3ed821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5724cf6c4fc340d8fb84bbe5fbcb60d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b977aa808076972d9651b0bb6f3587b.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e270e5e488ded8f5eafb66f2df173692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b705d046e7fae44064427a61c5558d19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525f894bd48d1634ac035205be132cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1997004ac72ebafff467930153a7bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca05074e5a317ae45d073962bdf74dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85ba3e4b3a2464076c4e2e6fd82d8ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
名校
4 . 已知函数
是偶函数.
(1)求实数
的值;
(2)设
,若函数
有唯一的零点,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb17b82bda4775d92390909352409ff.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f17664495b0d0cd793ad169932ac335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b7c2420c387be8882df4359ac10b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2020-02-24更新
|
766次组卷
|
4卷引用:四川省乐山市2018-2019学年高一上学期期末数学试题
名校
5 . 如果函数
在其定义域D内,存在实数
使得
成立,则称函数
为“可拆分函数”.
(1)判断函数
,
,
,
,
是否为“可拆分函数”?(需说明理由)
(2)设函数
为“可拆分函数”,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3102c0a2f53b80f9dddbf9352537e8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89a64a9bab61d99b7d40fa3731bf75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04e15196ce905f578e53b845242ee30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c180ff0524b2c68e7bc8bf39b5cc2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c80ac9de6fdc481ee26495bf1f275aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e0fef412f891d757bd56ad52e0ae7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65de81daa1c7366aa7d0553495344eeb.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45fdd9c21023e3bb7ea4ac457b35e529.png)
您最近一年使用:0次
2020-02-18更新
|
497次组卷
|
3卷引用:江西省南昌市第二中学2018-2019学年高一上学期期中数学试题
6 . 已知函数
,
,函数
,记
.把函数
的最大值
称为函数
的“线性拟合度”.
(1)设函数
,
,
,求此时函数
的“线性拟合度”
;
(2)若函数
,
的值域为
(
),
,求证:
;
(3)设
,
,求
的值,使得函数
的“线性拟合度”
最小,并求出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1adbb025e3b6634c2f5e1a40889d9604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689a2fa2ec3e37c5acf786658697b8a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311cff9a7159c55c44aa8be7a28bfc8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ced7931e3e2e2bb9dc6d38c822c9453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10f45674432012334770166a3df28fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914cb6f0947d79aa0805aafcf8bac008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1adbb025e3b6634c2f5e1a40889d9604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34094c493719582b4020ccb9599b374b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7961cbe98aac6a5fdee94582c341b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a4cb45ca6e42ced4a5c4026e2290f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88cdc21c30123b045d389610607a5b7d.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771003aed4d4b3b7d25ef8c4eb178b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10f45674432012334770166a3df28fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
您最近一年使用:0次
名校
解题方法
7 . 设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f8e7a6e86f331925745519ba71397.png)
为奇函数.
(1)求实数
的值;
(2)设
,若不等式
在区间
上恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f8e7a6e86f331925745519ba71397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f57c6b61b0ad34191482536a3c64d1.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6baeb64d5c21d31216904eecf1149a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed416d66239d99abaeee6f2a53af4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ac6622911e8c075f187d2611a2e815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2020-02-08更新
|
315次组卷
|
3卷引用:2016届上海市高境第一中学高三下学期5月热身(理)数学试题
8 . 已知
,
,
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d671628856390127cbffd2f8bd098e.png)
(1)当
时,请写出
的单调递减区间;
(2)当
时,设
对应的自变量取值区间的长度为l(闭区间
的长度定义为
)求l关于a的表达式,并求出l的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43be8655375defb2d244844cbba59ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55b6ea77ab1bb966da0ca0e73b97dd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d671628856390127cbffd2f8bd098e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a59011b33c66ca24e0fed4243b8e704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e669d502287cab6a74d72fb4aa1ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b85a97933a1d984f6e484b4021c800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64da75a02173c2a5eb40f4c68d0f4f36.png)
您最近一年使用:0次
9 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce659d4f77e894247a1da3c86207bf9.png)
.
(1)若
,求
的单调区间;
(2)若关于
的方程
有四个不同的解
,求实数
应满足的条件;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce659d4f77e894247a1da3c86207bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdaeb91344d30b91d26fba3484a00fd1.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976d18a5396ba232f0aa38d136f1d749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ccd22fd0ca1a8e1468329284f91b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cb11daf6a3835797b55c9299fe4423a.png)
您最近一年使用:0次
2020-02-07更新
|
249次组卷
|
2卷引用:上海市理工附中等七校2016届高三下学期3月联考(文)数学试题
名校
10 . 已知函数
(
,
).
(1)若函数
的图象与直线
均无公共点,求证:
;
(2)若
,
时,对于给定的负数
,有一个最大的正数
,使
时,都有
,求
为何值时
最大?并求
的最大值;
(3)若
,且
,又
时,恒有
,求
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce086037087f58409a28b4885979fd77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0e9d1ad9561d693958756ee8398218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3051f43ac48c0a730a791b8a93ad37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abffa1d225ca1e8bd2d15ab6d3ad9a50.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9439d9d9bc4f93dce4b94d1e33e06bec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760f804646698060703c5458ff5637c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044934f7dbd6847a30f13a34c9bb4e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdb19e1863e40b863519bca9edcdf33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760f804646698060703c5458ff5637c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760f804646698060703c5458ff5637c7.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77cdb8806a697e8e5480fad9c380baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdf1eec5487c094e8d38cbc77b91604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
您最近一年使用:0次