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  • 英語幾何題!

    英語幾何題!
    If the foci of an ellipse are two points of the trisection of the major axis,then the ratio of the distance between the directrix to the distance between the foci is____?
    英語人氣:856 ℃時間:2020-05-22 16:39:12
    優(yōu)質(zhì)解答
    Let's assume the major axis is the x-axis,the ellipse is expressed as x²/a² + y²/b² = 1The foci are F1(-c,0),F2(c,0),F1F2 = 2c = 2√(a² - b²)The vertexes on the major axi...
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