Question

D= 1-2- 2^2- 2^3- 2^4-...- 2^31

Answer 1

Sửa đề: \(A=2+2^2+...+2^{31}\)

=>\(2A=2^2+2^3+...+2^{32}\)

=>\(2A-A=2^2+2^3+...+2^{32}-2-2^2-...-2^{31}\)

=>\(A=2^{32}-2\)

\(D=1-2-2^2-...-2^{31}\)

\(=1-\left(2^{32}-2\right)=3-2^{32}\)