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求证:双曲线x²-15 y²=15与椭圆x²÷25+y²÷9=1的焦点相同
人气:231 ℃ 时间:2020-02-05 22:20:54
解答
x^2/15 - y^2 = 1, a^2 = 15, b^2 = 1, c^2 = a^2 + b^2 = 16, c = 4
同样,椭圆的c^2 = 25-9 = 16, c = 4
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