英语几何题!急!
假设长轴是x轴,椭圆表示为x?/a?+ y?/b?= 1
焦点是F1(-c,0),F2(c,0),F1F2 = 2c = 2√(a?-乙?)
长轴上的顶点是A1(-a,0),A2(a,0),A1A2 = 2a
F1和F2是长轴三等分的两点,所以A1A1 = 3F1F2
2a = 3*2√(a?-乙?)
a = 3√2b/4
c = √2b/4
它的直接矩阵是:y = a?/c,它们之间的距离是2a?/c = 9√2b/2
2a?/c : 2√(a?-乙?)= 9√2b/2 : 2*√2b/4 = 9