1.拋物線x2 = 12y上有兩點A(x1 , y1)﹐B(x2 , y2)且AB過焦點﹐已知AB=16﹐則y1 + y2 =(A)6 (B)8 (C)10 (D)12 (E)14 ﹒

問題詳情

1.拋物線x2 = 12y上有兩點A(x1 , y1)﹐B(x2 , y2)且AB過焦點﹐已知AB=16﹐則y1 + y2 =
(A)6
(B)8
(C)10
(D)12
(E)14 ﹒

答案：D
難度：困難0.285714
統計：A(0),B(1),C(5),D(4),E(1)

【年級】大一上

【評論內容】求大神解惑(跪)~~~