а ) а ^ 3 - 8 = a ^ 3 - 2 ^ 3 = ( a - 2) * ( a ^ 2 + 2 * a + 2 ^ 2 ) = ( a - 2) * ( a ^ 2 + 2 * a + 4 );б ) 8 * m ^ 3 - 1 = 2 ^ 3 * m ^ 3 - 1 = (2 * m ) ^ 3 - 1 = ( 2 * m ) ^ 3 - 1 ^ 3 = ( 2 * m - 1 ) * ( ( 2 * m ) ^ 2 + 2 * m * 1 + 1 ^ 2 ) = ( 2 * m - 1 ) * ( 4 * m ^ 2 + 2 * m + ) ; в) x ^ 9 + 27 * y ^ 3 = ( x ^ 3 ) ^ 3 + 3 ^ 3 * y ^ 3 = ( x ^ 3 ) ^ 3 + ( 3 * y ) ^ 3 = ( x ^ 3 + 3 * y ) * ( ( x ^ 3 ) ^ 2 + x ^ 3 * 3 * y + ( 3 * y ) ^ 2 ) = ( x ^ 3 + 3 * y ) * ( x ^ 6 + 3 * x ^ 3 * y + 9 * y ^ 2 ).