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雙曲線x²;/a-y²;/2=1的焦點在x軸 為c²;=a+2 所以橢圓x²;/4+y²;/a²;=1的焦點也在x軸 c²;=4-a²; 所以4-a²;=a+2 解之得a=-2或1 由雙曲線x²;/a-y²;/2=1 可知a>0(因為-y²;/ 2中有負號) 所以a=1
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