可

看到以前拿來當圖畫紙亂畫的背面竟然是數學講義XD
                                                                               
                                                                               
求下列方程式:
1.焦點F(0,-2)，準線平行於x軸，正焦弦長為8
                                                                               
                                                                               
誰知道啊!!! (╯-_-)╯┴─┴
全部還給老師了.
而且我解答的超乾淨的，一定是，絕對是抄別人的啊!!!!
                                                                                
                                                                                
                                                                                                                       
Ans:
有兩解:
                                                                               
正焦弦長=4|c|
c= ±2
                                                                               
1.c=2 v=(0,-4)
  x平方=8(y+4)
                                                                               
2.c=-2 v=(0,0)
  x平方=-8y
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
高中的我好厲害orz
現在一整個退化，我一定是得了失智症 囧