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橢圓=1上一點(diǎn)M到左焦點(diǎn)F₁的距離為2，N是MF₁的中點(diǎn)，O是原點(diǎn)，則|ON|=__________.

橢圓=1上一點(diǎn)M到左焦點(diǎn)F的距離為2, N是MF的中點(diǎn),則=(  )

A．2                B．4                C．6                D．

 

橢圓=1上一點(diǎn)P到左焦點(diǎn)F₁的距離為2，M是線段PF₁的中點(diǎn)，則M到原點(diǎn)O的距離等于(    )

A.2       B.4        C.6        D.8

橢圓+=1上一點(diǎn)P到左焦點(diǎn)F₁的距離為2，M是線段PF₁的中點(diǎn)，則M到原點(diǎn)O的距離等于

A.2                                                                 B.4

C.6                                                                 D.8

橢圓+=1上一點(diǎn)P到左焦點(diǎn)F₁的距離為2，M是線段PF₁的中點(diǎn)，則M到原點(diǎn)O的距離等于  （    ）

A.2                                                                 B.4

C.6                                                                 D.8