\[\boxed{\text{322\ (322).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[1)\ \left( 2x^{2} - 14x + 9 \right) + (*) =\]
\[= 20 - 10x\]
\[*\ = 20 - 10x - \left( 2x^{2} - 14x + 9 \right)\]
\[*\ = 20 - 10x - 2x^{2} + 14x - 9\]
\[*\ = - 2x^{2} + 4x + 11.\]
\[2)\ \left( 19a^{4} - 17a^{2}b + b^{3} \right) - (*) =\]
\[= 20a^{4} + 5a^{2}b\]
\[*\ = - a^{4} - 22a^{2}b + b^{3}\text{.\ }\]