曲线x^2/25+y^2/9=1与x^2/(9-k)+y^2/(25-k)=1(0

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曲线x^2/25+y^2/9=1与x^2/(9-k)+y^2/(25-k)=1(0
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曲线x^2/25+y^2/9=1与x^2/(9-k)+y^2/(25-k)=1(0
曲线x^2/25+y^2/9=1与x^2/(9-k)+y^2/(25-k)=1(0

曲线x^2/25+y^2/9=1与x^2/(9-k)+y^2/(25-k)=1(0
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