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Thứ Hai, 9 tháng 3, 2020

Câu 36: Cho phương trình ${{\log }_{9}}{{x}^{2}}-{{\log }_{3}}\left( 4x-1 \right)=-{{\log }_{3}}m$ ( m   là tham số thực). Có tất cả bao nhiêu giá trị nguyên của  để phương trình đã cho có nghiệm?
A. $5$.                                                      B. $3$.                     
 C. Vô số.                                               D. $4$.

$\left\{ \begin{align} & \\ & \\ \end{align} \right.$ $$\begin{cases} x^2 + y^2 + z^2 = 3 & \color{red}{(1)} \\ xy + yz + zx = 3 & \color{red}{(2)} \\ xyz = 1 & \color{red}{(3)} \end{cases} $$