Question

упростите выражение
(y-3)(y^2+3y+9)-y(y-3)(y+3)-(y+3)^2
(a-b)(a+b)(a^4+a^2b^2+b^4)

Answer 1

$1){y}^{3} - 27 - y( {y}^{2} - 9) - {y}^{2} - 6y - 9 = \\ {y}^{3} - 27 - {y}^{3} + 9y - {y}^{2} - 6y - 9 = \\ - {y}^{2} + 3y - 36 \\ 2)( {a}^{2} - {b}^{2} )( {a}^{4} + {a}^{2} {b}^{2} + {b}^{4} ) = \\ {a}^{6} - {b}^{6}$