椭圆右焦点坐标为（1,0）,设直线方程为 y = k(x-1),代入椭圆方程得 x^2/5+k^2*(x-1)^2/4 =1 ,化简得 (5k^2+4)x^2-10k^2*x+5k^2-20 = 0 ,设 A（x1,y1）,B（x2,y2）,则 x1+x2 = 10k^2/(5k^2+4),x1*x2 = (5k^2-20)/(5k^...