1 . 有一座大桥既是交通拥挤地段,又是事故多发地段,为了保证安全,交通部门规定:大桥上的车距
与车速
(
)和车身长
的关系满足:
(
为正的常数),假定大桥上的车的车身长都为
,当车速为
时,车距为
个车身长.
(1)写出车距
关于车速
的函数关系式;
(2)应规定怎样的车速,才能使大桥上每小时通过的车辆最多?
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/f8efa42f8c2d4370bb09eba4b6f62458.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/2b946890619b41659a0ab4bb0c75c0b8.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/6ec3a7b14c1d47419c7b84533c47c73d.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/a570a24f37c94bafab922d8a301d9bd3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/6e85db9fdf3b440081ade796ea2b9d59.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/42bad7952cfa4beba858887d856fcbc0.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/34bfca0bf05b41a78e9409071daa14c1.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/f937707c73bc431fab1e75b9f627605d.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/6de1c2c895024157a405f5af450b9c03.png)
(1)写出车距
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/b945b226af8b4509905f7e705015d1bf.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573730816/STEM/2b946890619b41659a0ab4bb0c75c0b8.png)
(2)应规定怎样的车速,才能使大桥上每小时通过的车辆最多?
您最近一年使用:0次
2 . 已知定义域为
的偶函数
满足:对于任意实数
,都有
,且当
≤
≤
时,
.
(1)求证:函数
是周期函数;
(2)当
时,求
的解析式.
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573706240/STEM/83795ec79233496cb717d70890e356ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573706240/STEM/95ea0252b8a04334bb1635247c5bb915.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573706240/STEM/91274b5e6c7f4caaadafc77af47790b9.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573706240/STEM/a8108fb4b5274adb8e4953dd1c86c69f.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573706240/STEM/95ea0252b8a04334bb1635247c5bb915.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573706240/STEM/03673a041a36479e9ea5647cf2d3d957.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573706240/STEM/2f0446466f95483f8a20e84d54a6a012.png)
(1)求证:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573706240/STEM/593277a2f75f4cf98dcc5475cb7d527f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
您最近一年使用:0次
解题方法
3 . 设
,
(
).
(1)求
在区间
上的值域;
(2)若对于任意
,总存在
,使得
成立,求实数
的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573763584/STEM/d21848ea1740461aa63d610ddd89f5e7.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573763584/STEM/a12cd64575e741baa3e03ec466860cf6.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573763584/STEM/a07536c4b85946e78579f033a966a02c.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573763584/STEM/fbe6e16dafdb49cf85994ee438540a60.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573763584/STEM/88428fd8a5854fb59af0b36fcfaaeac7.png)
(2)若对于任意
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573763584/STEM/a1b78e1f39114b999605a7207f850b17.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573763584/STEM/13e77aeebe4945b0abb7e7819d517e37.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573763584/STEM/72eab3570007416da21b32dcd14eaf44.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573763584/STEM/b9fffd0e8ff54592bf2c31abdb23977b.png)
您最近一年使用:0次