在直角坐标系中,过点A(1,2)且斜率小于0的直线中,当在两轴上截距之和最小时,求该直线斜率及方程.
考点分析:
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A(5,y
1),B(x
2,y
2),C(100,y
3)是双曲线
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上三点,O是坐标原点.若
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,且AC的斜率为
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,则BC的斜率为
.
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过椭圆
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的一个焦点F作弦AB,若|AF|=m,|BF|=n,则
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=
.
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由曲线x
2+y
2=|x|+|y|所围成的图形面积为
.
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若圆锥曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481119248/SYS201311012252094811192012_ST/0.png)
+
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=1的焦距与k无关,则它的焦点坐标是
.
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已知椭圆
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+
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=1,过右焦点F作不垂直于x轴的弦交椭圆于B两点,AB的垂直平分线交x轴于N,则|NF|:|AB|等于( )
A.
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B.
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C.
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D.
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