... 13 2 − 12 2 = (13 − 12 ) (13 + 12 ) = 13 − 12 13 + 12 = 1. 5 = b / 17 − 82 = (17 − 8) (17 + 8) = 17 − 17 + = 3.5 = 15 c / 11 7 − 10 82 = (11 7 − 10 8) (11 7 + 10 8) = 11 7 − 10 8 11 7 + 10 8 = 3 .15 = 45 d / 313 2 ... thức lấy 1/ 1 1 1 1 1. 6 = = = = = = 600 6 .10 0 10 0 10 0 10 10 60 2/ 11 11 11 1 11 11. 15 16 5 16 5 = = = = = = 540 15 .36 15 36 36 15 15 2 15 2 90 3/ 3 3 3.2 = = = = = = 50 25.2 25 25 5 10 4/ ... 49 25 49 7 0, 01 = 0, 01 = 0, 01 = = 16 16 16 10 24 b / 1, 44 .1, 21 − 1, 44.0, = 1, 44 (1, 21 − 0, 4) = 1, 44.0, 81 = 1, 44 0, 81 = 1, 2.0 ,9 = 1, 08 16 52 − 12 42 (16 5 − 12 4) (16 5 + 12 4) 41. 289...