Which expression is equivalent to \( \left(\frac{(2.1)^{5}}{(0.9)^{4}}\right)^{3} ? \)

h) \( \left\{\begin{array}{l}x+y+z=50 \\ 2 x=y+1 \\ 2 x=5 z\end{array}\right. \)

Utiliza logaritmos para resolver: \( 5^{x} = 125 \).

95 If \( \frac{\log x}{\log 3}+\frac{\log x}{\log 9}+\frac{\log x}{\log 27}=22 \), then \( x=\ldots \ldots \ldots \ldots \ldots \) \( \begin{array}{llll}\text { (a) } 3^{2} & \text { (b) } 3^{9} & \text { (c) } 3^{12} & \text { (d) } 3^{27}\end{array} \)

Determine the value(s) of k for which the equation \( \frac{1}{\mathrm{k}}=\mathrm{x}^{2}-\mathrm{x}+1 \) where \( \mathrm{k} \neq 0 \) has real roots.

Решить уравнения \( (306-309) \) 306. а) \( 2 x^{3}-3 x^{2}-3 x+2=0 \)