百科知识

直线y=kx+1与双曲线3x^2-Y^2=1交于AB两点k何值时?

2011-12-07 21:16:56圆***
直线y=kx+1与双曲线3x^2-Y^2=1交于AB两点k何值时AB两点均在左支:把y=kx+1代入3x^2-Y^2=1得 (3-k^2)x^2-2kx-2=?

最佳回答

  • 把y=kx+1代入3x^2-Y^2=1得 (3-k^2)x^2-2kx-2=0 x1*x2=-2/(3-k^2)>0 (1) x1+x2=2k/(3-k^2)0即k>0 综合知k〉√3
    2011-12-07 22:58:14
  • 很赞哦! (239)