求函数
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28c3d850fd58bbe70c0662e8ad84fad.png)
更新时间:2019-11-10 11:50:04
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【推荐1】已知正方体
的棱长为2,点
分别是棱
和
的中点.
(1)求
与
所成角的大小;
(2)求
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9294c4766531857534a81bc536df57e6.png)
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适中
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【推荐2】求下列方程的解集:
(1)
; (2)
;
(3)
; (4)
;
(5)
; (6)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12bf53dc40378662ed0f88130718cefa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635f72827fd15c0e5322ce9b44fdd784.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f8d0e9c21895f6231a157be4b897c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a3fbaa7a7d43ed1446b7bab25612f38.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2aa0dcc819be59066769d83c5f64f73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655537d80a074fa4a563c4b041ea8ca4.png)
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【推荐1】向量
,
,函数
.
(1)求函数
的对称中心;
(2)若函数
在
上有5个零点,求
的取值范围;
(3)在
中,内角
,
,
的对边分别为
,
,
,
的角平分线交
于点
,且
恰好为函数
的最大值.若此时
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5aa2ee520b0929cbd8b47ab21fbeee8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d521c93bbefd7ae7d02241842b045840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff584eb78388696f1df87183a030daee.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4650c3ebfaa8265f1eeaa5dc1367e932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b66315bbd971a90753a9819515b7a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2231c2f7241d4fb4c48c3105700ea0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/016b4882ce2d1ce31401a09f5dde7291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3b0f12d5026161e6f86c0f0c5942d5.png)
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名校
解题方法
【推荐2】培养某种水生植物需要定期向培养植物的水中加入物质
,已知向水中每投放1个单位的物质
,
(单位:天)时刻后水中含有物质
的量增加
,
与
的函数关系可近似地表示为关系可近似地表示为
.根据经验,当水中含有物质
的量不低
时,物质
才能有效发挥作用.
(1)若在水中首次投放1个单位的物质
,计算物质
能持续有效发挥作用几天?
(2)若在水中首次投放1个单位的物质
,第8天再投放1个单位的物质
,试判断第8天至第12天,水中所含物质
的量是否始终不超过
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8c30080c0a338cf7b84c25dac2102a.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/c495417733c4dc452f3f996d79d44167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a7cf0b67d219d04f685eaa4f35dcb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(1)若在水中首次投放1个单位的物质
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)若在水中首次投放1个单位的物质
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04aa1ee529395ce1099cf6428e9956a1.png)
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