25) \( 5 x^{2}-7 x-3=0 \)

Simplificar y obtener la minima expresión: \( \frac{\frac{b}{a}+\frac{a-2 b}{b}}{\left(\frac{a^{2}+3 a b+3 b^{2}}{b}+\frac{b^{2}}{a}\right) \cdot(a-b)^{2}} \)

b) \( 5^{0}+\frac{1}{3} \cdot\left[\left(3-\frac{1}{5}\right) \cdot 5^{-2}+2 \cdot\left(1-\frac{2}{5}\right)^{3}\right]: \frac{4}{3} \)

If the system \( \left\{\begin{aligned}-4 x-5 y-4 z=-3 \\ -5 x+7 y-8 z=-7 \\ -6 x+19 y+h z=k\end{aligned}\right. \) has infinitely many solutions, then \( k=\square \) and \( h= \)

\begin{tabular}{l} B) DIRECTIONS: Solve each equation using the QUADRATIC FORMULA: \( x= \) \\ \( \qquad \)\begin{tabular}{|l|l|l}\hline 5\( ] c^{2}-5 c+4=0 \) & \( 6] b^{2}-b-12=0 \) & \( 73 a^{2}-4 a-12=0 \) \\ \hline\end{tabular} \\ \hline\end{tabular}

\( \log _{3}(2 x-5)=-2 \) Simplify your ansh