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⒈（1）方程式(k-2)x^2+y^2=k+3,表焦點在y軸上的雙曲線，求k值範圍？
（2）若x^2/(t+1)+y^2/(2t^2-4)=1表雙曲線，求t之範圍
（3）x^2/(t-4)+y^2/(t-3)=1表雙曲線，求t之範圍
(4)x^2/(t^2+2t-3)+(y-1)^2/(2t^2-3t-5)=1表雙曲線，求t之範圍
(5)x^2/(4-k)+y^2/(k-1)=1表雙曲線，且焦點在y軸上，求k之範圍

⒉F(3,1),F'(-1,2),P為平面上之任ㄧ點，令R為|PF-PF'|=k之圖形
（1）若R為雙曲線，則k之範圍為？。（2）若R為二射線，則k之範圍為？
（3）若R沒有圖形，則k之範圍為？。 （4）若R為一直線，則k之範圍為？

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