A b 2 ab 0 July 8, 2019 16 32 64 128 A 2 b 2 2ab 0 X 2 a b x ab 0 A 2 ab b 2 ≧ 0 A b 2 ab 0 হলে a b A b 2 ab 0 হলে a b কত A 2 b 2 ab a b 1 0 If a 2 b 5 and ab 0 If a 2 b 3 and ab 0 9x 2 3 a b x ab 0 Abx 2 a 2 b 2 x ab 0 Solve a b 2x 2 4abx ab 2 0 Nếu a 2 b 2 thì 0 ab Chứng minh a 2 ab b 2 0
