\[\boxed{\text{1006.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ \left( a^{2} - 7 \right)(a + 2) -\]
\[- (2a - 1)(a - 14) =\]
\[= a^{3} + 2a^{2} - 7a - 14 -\]
\[- \left( 2a^{2} - 28a - a + 14 \right) =\]
\[= a^{3} + 2a^{2} - 7a - 14 - 2a^{2} +\]
\[+ 28a + a - 14 = a^{3} + 22a - 28\]
\[\textbf{б)}\ (2 - b)(1 + 2b) +\]
\[+ (1 + b)\left( b^{3} - 3b \right) =\]
\[= 2 + 4b - b - 2b^{2} + b^{3} -\]
\[- 3b + b^{4} - 3b^{2} = b^{4} + b^{3} -\]
\[- 5b^{2} + 2\]