1 . 已知过点P(3,0)斜率为k的直线l交双曲线
右支于A、B两点,F为双曲线C的右焦点,
,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b30352c43707c4e54b94ce5b61f2e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a15f197804d75d00d9252a9c3ce575.png)
您最近一年使用:0次
2 . 设
,
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a564595e470d31c824b99575a53f9cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad63dc600cd9fcb1b69d360d909fc2d2.png)
您最近一年使用:0次
3 . 设椭圆C的左、右顶点为A,
,过右焦点
作非水平直线
与椭圆C交于P,Q两点,记直线AP,BQ的斜率分别为
,
,试证:
为定值,并求此定值(用a的函数表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d04015890783f6b8b0264b1d1c9127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67351fe10fcfc3f9072eec4c60bfaaa5.png)
您最近一年使用:0次
4 . 设f(m)是正整数m的各位数字的乘积,求方程
的正整数解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcc425363985780a7f22c23257c0ab1e.png)
您最近一年使用:0次