6. Kitob va daftar birgalikda 5800 so'm turadi, Kitob narxining \( 10 \% \) i daffar narxining \( 35 \% \) idan 220 so'm qimmat. Kitob va daftar alohi- da-alohida necha so'm turadi?

Multiply. \[ \frac{1}{2} x^{2}\left(8 x^{2}-4 x+1\right) \] \( \frac{1}{2} x^{2}\left(8 x^{2}-4 x+1\right)=\square \) (Simplify your answer. Use integers or fractions for any numbers in the expression.)

Multiply. \[ \left(x+\frac{2}{7}\right)\left(x-\frac{1}{7}\right) \] \( \left(x+\frac{2}{7}\right)\left(x-\frac{1}{7}\right)=\square \) (Use integers or fractions for any numbers in the expression.)

\( \leftarrow \begin{array}{l}\text { Multiply. } \\ \left(6 x^{2}+7\right)^{2} \\ \left(6 x^{2}+7\right)^{2}=\square \text { (Do not factor.) }\end{array} \)

Multiply. \( \left(7 x^{2}+2\right)\left(6 x^{2}+5\right) \) \( \left(7 x^{2}+2\right)\left(6 x^{2}+5\right)=\square \)

Multiply. \[ (x+5)(x+6) \] \( (x+5)(x+6)=\square \) (Simplify your answer.)