\begin{tabular}{l} Бүлэг 1. Алгебрын илэрхийлэл, тэгшитгэл \\ \hline \\ а) \( \left(2 a^{4}-5 a^{3} b-3 a^{2} b^{2}+a b^{3}-4 b^{4}\right)\left(a^{2}+2 a b+b^{2}\right) \) \\ б) \( \left(3 x^{4}-6 x^{3} y+4 x^{2} y^{2}-9 x y^{3}-y^{4}\right)\left(x^{2}-2 x y+y^{2}\right) \) \\ 7. Илэрхийллийг хялбарчил. \end{tabular}

a. \( \frac{2 x^{3}+6 x-6}{x^{3}-1} \)

1) \( \frac{10 x+8}{3 a-b}-\frac{9 x+5}{3 a-b}= \)

Diketahui sistem persamaan tinier berikut ini : \[ \begin{array}{l}-1 x+y+2 z=2 \\ 3 x-1 y+z=6 \\ -1 x+3 y+4 z=4\end{array} \] Tentukan solusi persamaan linear tersebut menggunakan metode gauss!

Subtract the polynomials: \( (5x^{3} + 2x^{2} - 7) - (3x^{3} - x^{2} + 4) \)

Roger was told to think of a number, add 20 , then divide the result by 3 . The answer was Jower than Roger's original number. Deteruine the range of possible numbers Roger may have originally chosen.