A 5 b 5 c 5 July 8, 2019 16 32 64 128 A 5 b 5 c 5 formula A 5 b 5 c 5 chia hết cho 30 A 5 b 5 c 5 d 5 A 5 b 5 c 5 d 5 e 5 If a b c 0 then a 5 b 5 c 5 A 5 b 2 b 5 c 2 c 5 a 2 A (- 5 7 b (- 4 5 and c 4 5
