\( \left( P \right) \) qua \(M \left( {4;1;2} \right) \) và cắt \(Ox, \, \,Oy, \, \,Oz \) để \(T = \left( { \dfrac{1}{{O{A^2}}} + \dfrac{1}{{O{B^2}}} + \dfrac{1}{{O{C^2}}}} \right) \min \). Khi đó \( \min T \) là:
A.\(\dfrac{1}{{15}}\)
B.\(\dfrac{1}{{21}}\)
C.\(\dfrac{1}{{16}}\)
D.\(\dfrac{1}{{20}}\)
A.\(\dfrac{1}{{15}}\)
B.\(\dfrac{1}{{21}}\)
C.\(\dfrac{1}{{16}}\)
D.\(\dfrac{1}{{20}}\)
Loga
Hóa Học lớp 12
