A = 1/2 + 1/4 + 1/8 + ...... + 1/512 + 1/1024
A x 2 = 1 - ( 1/2 + 1/4 + 1/8 + 1/16 + ..... + 1/512 + 1/1024 ) - 1/1024
A x 2 = 1 - A - 1/1024
A x 2 - A = 1- 1/1024
A = 1023/1024
Ta có: A = 1/2 + 1/4 + 1/8 + ...... + 1/512 + 1/1024
2A = 1 - ( 1/2 + 1/4 + 1/8 + 1/16 + ..... + 1/512 + 1/1024 ) - 1/1024
2A = 1 - A - 1/1024
2A - A = 1- 1/1024
A = 1023/1024
Ta có: A = 1/2 + 1/4 + 1/8 + ...... + 1/512 + 1/1024
2A = 1 - ( 1/2 + 1/4 + 1/8 + 1/16 + ..... + 1/512 + 1/1024 ) - 1/1024
2A = 1 - A - 1/1024
2A - A = 1- 1/1024
A = 1023/1024
