解题方法
1 . 某药品可用于治疗某种疾病,经检测知每注射tml药品,从注射时间起血药浓度y(单位:ug/ml)与药品在体内时间
(单位:小时)的关系如下:
当血药浓度不低于
时才能起到有效治疗的作用,每次注射药品不超过
.
(1)若注射
药品,求药品的有效治疗时间;
(2)若多次注射,则某一时刻体内血药浓度为每次注射后相应时刻血药浓度之和.已知病人第一次注射1ml药品,12小时之后又注射aml药品,要使随后的6小时内药品能够持续有效消疗,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/964609698358e6e31673615f150802ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57fa6097197c6943c40394eaceae732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35d774836119531a3eec0ee121a8585.png)
(1)若注射
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710dd2e08d422d57c65fd63f80509d84.png)
(2)若多次注射,则某一时刻体内血药浓度为每次注射后相应时刻血药浓度之和.已知病人第一次注射1ml药品,12小时之后又注射aml药品,要使随后的6小时内药品能够持续有效消疗,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2 . 记集合A和B分别为不等式
和
的解集.(以下结果请用区间表示)
(1)求出集合A、B;
(2)记全集
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361e355dd1c126d7ef9dbf021971be1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0650c3384d251d63269f2fff45617fce.png)
(1)求出集合A、B;
(2)记全集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860ebb6f76cd3cb9a265dfc233002a13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82fd1ee756ac1b0f950c0f6a2bce3178.png)
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3 . (1)若
,求
的最小值,并求此时x的值;
(2)解不等式
;
(3)计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9929b4a95df4cb001be158a1600ae5e4.png)
(2)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/609c326212b7f730962ec3fe1a2fab3b.png)
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e68bd306232fb7c3dab7b2e2c52c7da.png)
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解题方法
4 . 已知集合
,
.
(1)设
, 若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c79deaec32995e17969caf4dd20095aa.png)
求实数
的取值范围;
(2)设
, 当
时, 记![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e3ae41a67dfa1fb2e9d53732b3f896.png)
试求
中元素个数最少时实数
的所有取值,并用列举法表示集合
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d040f92d120aab48c6dc3a816453f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f953c77c654e064f730ec5ea522b96.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9d23925ff55121d4180c92a7e0d205.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c79deaec32995e17969caf4dd20095aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05250abe6da85eb0b555948d7dbaf317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0e166be11c06a67a99aefd52428472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a4eaa80b44625890339d6a0065c241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e3ae41a67dfa1fb2e9d53732b3f896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05250abe6da85eb0b555948d7dbaf317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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解题方法
5 . 求不等式的解集(写出必要的过程)
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a35555979ecc0abb9ce17e2fc8eacc44.png)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a35555979ecc0abb9ce17e2fc8eacc44.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b04398439d2a7867cf0a413edd40383.png)
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6 . (1)计算:
;
(2)求不等式的解集
.
(3)已知函数满足方程
,求
的解析式.
(4)已知函数
,求
的单调区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4a1b50c0c33b06f7d12db0acb3426e.png)
(2)求不等式的解集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e53d5a74eec643e381ff8b9d17085d.png)
(3)已知函数满足方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f5dd70e54064d97834cd1ba2f8a6fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(4)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9e414ec03fac1109660b59e568c470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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解题方法
7 . 几年国家出台的惠民政策越来越多,政府出资的“旧房改造”工程使得许多老旧校区旧貌换新颜,从根本上提高了百姓的生活质量.如图,在改造某小区时,要在一处公共区域搭建一间背面靠墙(墙长7米)的房屋,图形所示为房屋俯视图,房屋地面面积为
房屋正面的造价为600元
,侧面的造价为200元
,顶部总造价为4800元,如果墙面高为3m,不计房屋背面和地面的费用,设总造价为
元.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/23b944d4-c4e3-455e-9628-cbf94bc68775.png?resizew=163)
(1)请将总造价
表示为正面边长
的函数,怎样设计房屋边长能使总造价最低?最低总造价是多少?
(2)如果所需总费用不超过22800元,求房屋正面边长
的取值范围是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1c4402970edc16bbf33e726b41409c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4199642ca2ebc46683fb136c1ec5a97b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4199642ca2ebc46683fb136c1ec5a97b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/23b944d4-c4e3-455e-9628-cbf94bc68775.png?resizew=163)
(1)请将总造价
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)如果所需总费用不超过22800元,求房屋正面边长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解题方法
8 . 在以下三个条件中任选一个,求在这个条件下函数
,
的值域.
①函数
的定义域为
;
②函数
的定义域为集合
,集合
,集合
;
③函数
的定义域为
.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e18f7385debff741ef9b9d280412fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acfc595518cf752e1c7903dfff93dbda.png)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b5e8736a6379520deafac577b821d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02bff0b90555b9c99687b9ad76685cfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c685122d929f42e6faf928436910aa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/402f6800233ef353db3c93b91f8858e1.png)
③函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95fcbed70e352610c65025b11c2acc44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
注:如果选择多个条件分别解答,按第一个解答计分.
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9 . 解下列不等式组和方程,并将解集表达成区间或集合的形式.
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e06aaee8a37832abfd95ebc03cab39fc.png)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e06aaee8a37832abfd95ebc03cab39fc.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b651c1e19bb1ccef9656db6fa2ec197.png)
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10 . 已知关于x的函数
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936719ca6ef48b7baa054ebe4561e5a7.png)
(1)若
,求x取值的集合;
(2)若对
,关于x的不等式
恒成立,求实数a的取值范围;
(3)若
,试讨论x取值的集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b927dfb4506976cbf2ab941442be8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd4af7c872fb479131df3d2a01db5e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936719ca6ef48b7baa054ebe4561e5a7.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12021b74e36a4394c9786d2de00cbbf5.png)
(2)若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4242185064b5c5a4f34ecd9d10af6c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c37c6ff48f613a54d47f226bcf60a43.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1cec04a1887313401ec574d0b46ea6d.png)
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