A 3 27 b 3 2a 2 b 6ab 2 July 8, 2019 16 32 64 128 A 3 27b 3 2a 2 * b 6a * b 2 A 3 −27b 3 27a ^ 5 * b ^ 3 * ((3b)/(a ^ - 2)) ^ - 2
