@py
Bài làm :
`D = 2^(100) - 2^(99) - ... - 2^2 - 2^1 - 1`
`→D = 2^(100) - 2^(99) - ... - 2^2 - 2 - 1`
`→2D = 2( 2^(100) - 2^(99) - ... - 2^2 - 2 - 1 )`
`→2D = 2^(101) - 2^(100) - ... - 2^2 - 2^1`
`→2D - D = 2^(101) - 2^(100) - 2^(100) + 1`
`→D = 2^(101) - 2 . 2^(100) + 1`
`→D = 2^(101) - 2^(101) + 1`
`→D = 0 + 1`
`→D = 1`
Vậy `D = 1`