问题描述:
椭圆X^2/25+y^2/9=1 与曲线为X^2/(25-k)+y^2/(9-k)=1 (k<25,k≠9)总有相同的焦点和相同的焦距吗?
2)请再帮我依次解一道题:椭圆X^2/25+y^2/9=1 与x^2/(9-k)+y^2/(25-k)=1(0
2)请再帮我依次解一道题:椭圆X^2/25+y^2/9=1 与x^2/(9-k)+y^2/(25-k)=1(0
问题解答:
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