解(2)(3)问,
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解(2)(3)问,
![](http://img.wesiedu.com/upload/9/d8/9d8ff0564c214d1d15d2fd0e9b464a79.jpg)
![](http://img.wesiedu.com/upload/9/d8/9d8ff0564c214d1d15d2fd0e9b464a79.jpg)
![解(2)(3)问,](/uploads/image/z/684836-44-6.jpg?t=%E8%A7%A3%EF%BC%882%EF%BC%89%EF%BC%883%EF%BC%89%E9%97%AE%2C%26nbsp%3B)
1. C=根号(2),a/b = 根号(2),a = 2, b=根号(2)
2. 由题意,P(1,根号(3/2)),要PA,PB倾斜角互补,PA,PB与x轴交点为C,D,PCD为等腰,设Cx = a, 则Dx=2-a, PA所在方程为y = 根号(3/2)*(x-a)/(1-a), PB: y = 根号(3/2)*(x-2+a)/(a-1), PB直线方程:y= 根号(3/2)(x-2+a)/(a-1). 当a= 0时,A(-1,-根号(3/2)),B(2,0),AB的斜率为1/根号(6),当0
2. 由题意,P(1,根号(3/2)),要PA,PB倾斜角互补,PA,PB与x轴交点为C,D,PCD为等腰,设Cx = a, 则Dx=2-a, PA所在方程为y = 根号(3/2)*(x-a)/(1-a), PB: y = 根号(3/2)*(x-2+a)/(a-1), PB直线方程:y= 根号(3/2)(x-2+a)/(a-1). 当a= 0时,A(-1,-根号(3/2)),B(2,0),AB的斜率为1/根号(6),当0