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橢圓x^2/9+y^2/4=1的焦點座標為F1(-√5,0);F2(√5,0) 所以這也就成了所求的雙曲線的焦點,則c=√5;那麼e=c/a=√5/a=√5/2 得a=2,焦點在x軸上,所以所求的雙曲線方程為:x^2/4-y^2=1
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