橢圓的焦點(diǎn)在y軸上..則這樣的橢圓的個(gè)數(shù)為 查看更多

 

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橢圓的焦點(diǎn)在y軸上,且,則這樣的橢圓的個(gè)數(shù)為    

 

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橢圓的焦點(diǎn)在y軸上,且m∈{1,2,3,4,5},n∈{1,2,3,4,5,6},則這樣的橢圓的個(gè)數(shù)為    

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設(shè)橢圓的焦點(diǎn)在y軸上,a∈{1,2,3,4,5},b∈{1,2,3,4,5,6,7},則這樣的橢圓的個(gè)數(shù)是                                                        (    )

  (A)70                 (B)35              (C)30              (D)20

 

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(理)橢圓的焦點(diǎn)在y軸上,且m∈{1,2,3,4,5,5},n∈{1,2,3,4,5,6},則這樣的橢圓的個(gè)數(shù)為________

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設(shè)橢圓的焦點(diǎn)在y軸上,a∈{1,2,3,4,5},b∈{1,2,3,4,5,6,7},則這樣的橢圓的個(gè)數(shù)是                                                       (   )

A.70B.35C.30D.20

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