(4) E'zoza va Barnodagi pullarning nisbati \( 7: 3 \) edi. E'zoza pulidan Barnoga bergach, E'zozadagi pulning Barnodagi pulga nisbati \( 7: 13 \) bo'lib qoldi. Shundan so'ng Barnodagi pul E'zozanikidan 20400 so'mga ko'p bo'ldi. E'zoza Barnoga qancha pul bergan?

Example Solve the equation \( 2 x^{2}+4 x-10=0 \) with error precision 0.05

(i) \( 2.25 \% \) of \( x \) is 630

Simplify the following: (1) \( \frac{x-1}{x^{2}+3 x+2} \div\left[\frac{x-3}{x+1}-\frac{x-4}{x+2}\right] \) (2) \( \frac{\frac{6 x+5}{x-5}}{\frac{3 x+20}{x-5}+2} \) (3) \( \frac{a^{2}+\left(1-a^{2}\right)}{(1+a) a} \times \frac{(1+a) a}{a^{2}-\left(1-a^{2}\right)} \)

\begin{tabular}{l} Evaluate the expression when \( c=8 \) and \( d=4 \). \\ \( \qquad \frac{48}{c}+d \) \\ \( \square \square \) \\ \hline\( \square \) \\ \hline\end{tabular}

Simplify the following: (1) \( \frac{x-1}{x^{2}+3 x+2} \div\left[\frac{x-3}{x+1}-\frac{x-4}{x+2}\right] \) (2) \( \frac{\frac{6 x+5}{x-5}-1}{\frac{3 x+20}{x-5}+2} \) (3) \( \frac{a^{2}+\left(1-a^{2}\right)}{(1+a) a} \times \frac{(1+a) a}{a^{2}-\left(1-a^{2}\right)} \)