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1 . 已知函数f(x)=|2x﹣a|+|x﹣1|
(1)若f(1)≥2,求实数a的取值范围
(2)若不等式f(x)≤x对任意x
[2,
]恒成立,求实数a的取值范围.
(1)若f(1)≥2,求实数a的取值范围
(2)若不等式f(x)≤x对任意x
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02d44492b51b0e08208fdc0d1707025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
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2 . 已知关于x的不等式
.
(1)当
时,求不等式的解集;
(2)若该不等式有实数解,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d5599ef30821855ab49e13366ea376.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
(2)若该不等式有实数解,求实数a的取值范围.
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2019-12-23更新
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3卷引用:重庆市江津中学、合川中学等七校2019-2020学年高三第三次诊断性考试数学(理)试题
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3 . 已知函数
.
(1)解不等式
;
(2)设函数
的最小值为t,实数
满足
,且
.
求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e42491e1a3b262360e42c0b1f39d13.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335c6cb34ba1ae8efc3c9711d38b0c55.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1863f07aaa3d1060a60732b9d59e8c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a27cac3985e9613d24e42949558f0e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e99853dddd205a4d75ace309731ab7.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b0f9616f5561636d3a46ec1f849308.png)
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4 . 已知函数
,
.
(1)若函数
的最小值为
,求实数
的值;
(2)当
时,函数
图象恒在函数
图象的上方,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b29c4d9fc2b3095c4abb23ba456b088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d6c4d2eeaa6d0d0e81cec7d55b7f9e6.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6ddb3766b5215c115a0abf597598aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4de751ce0bec498c84e9e678103a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2019-12-13更新
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5 . 已知关于
的不等式
的解集为
.
(1)求实数
,
的值;
(2)求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/973c9b75cb5ee062ee3f3d5f07c2ede7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c40c41943d8e9b3dffae465e2b77ba4.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50cdc3e138f11aaacc98b335698c9799.png)
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6 .
.
(1)若
,求
的取值范围;
(2)设(1)中
的最小值为
,若
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471a28757ed1be2cc0a6822a0449be57.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e093e376e8380b4ca2f7219f8a11f77f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)设(1)中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede77c49097f5c864ef3df8cf0016178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfcd928edb7907b5b154988c4ef411e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fde1049ec0c6394020f7f5b95202f6e7.png)
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2019-11-27更新
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7 . 已知函数
.
(1)当
时,求不等式
的解集;
(2)若关于
的不等式
的解集包含
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5855e2a5e61d3e6eb98f032e10e43dea.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3ed6d2f29d4d4d5d017a55834b2b0b.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc7051287cb619f6021a235e446c612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb87c830a03204a5b783ad4c2ba49c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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8 . 已知函数
,
.
(1)当
时,求不等式
的解集;
(2)若不等式
的解集包含
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96d6a77f9a05311f4e30ba1bcda05a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7984838168bb147f1f01b3c5212aab57.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e56f6161c5ed4feb04e057a14c1975.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43920f5171ed31db2520ef00e4c5fc24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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9 . 设函数
.
(1)当
时,求不等式
的解集;
(2)对
,都有不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2747c1d5f69039ecc5568a8887d24648.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/904caee5239c84d0396fb87cbc8e8043.png)
(2)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8e71378a3c5818b9e3e41ef7a4ac1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f080a0ac55d5392e9a702199352dca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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10 . 设函数
.
(1)求
的解集;
(2)若
的最小值为
且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6964f26e70afe3d425ea971d3212bb9a.png)
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d7fe3fe27f9f3b02dc9f0a12e42d46.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a7d7cf29b4f829b98ee7eebccaec07.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6964f26e70afe3d425ea971d3212bb9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9437cb58bf14be1e89af1d44b23caae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404c3be5eb6a7c2d3c6011c58cd2056f.png)
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