問題詳情

(9)Show that the parabola y = -x2 and ihe line x-4y- 18 = 0 intersect al right angle al one of their points of intersection (於二個交點之一以直角相交).

參考答案

答案:D
難度:簡單0.85283
統計:A(33),B(35),C(14),D(678),E(0)

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