... 1tínhLai 2 tínhLai 3tínhAaAaBbAaBbDd 2 1 2 2 2 3 2 1 x 2 1 2 2 x 2 2 2 3 x 2 3313 2 33(1: 2: 1)1(1: 2: 1) 2 (1: 2: 1)3 2 1 2 2 2 3( 3: 1)1( 3: 1) 2 ( 3: 1)3Lai ntínhAaBbDd 2 n 2 n ... . 3/4 . 1 = 9/ 32 9/ 32 3T + 1L 4,1 ,2 3 1. 3/4 . 1 /2 . 1/4 = 3/ 32 15/ 32 4,1,3 2 1. 3/4 . 3/4 . 1 /2 = 9/ 32 4 ,2, 3 1 1. 1 /2 . 3/4 . 1/4 = 3/ 32 2T + 2L 4,1 2, 3 1. 3/4 . 1 /2 . 1/4 = 3/ 32 _________________________________________________________________________________Gi¸o ... nam 22 Giáo án dạy học sinh giỏi lớp 9 _____________________________________________________________________________7/ 324 ,2 1,3 1. 1 /2 . 1/4 . 1/4 = 1/ 32 4,3 1 ,2 1. 3/4 . 1/4 . 1 /2 = 3/ 32 1T...