Question

cho E = 1+2+2mũ2+2mũ3+...+2mũ9.

Answer 1

Ta có:  2E= 2+2^2+2^3+2^4+...+2^10

2E - E = (2+2^2+2^3+2^4+...+2^10) - (1+2+2^2+2^3+...+2^9)

E = 2^10-1

Answer 2

\(E=1+2+2^2+2^3+...+2^9\)

=>\(2E=2+2^2+2^3+2^4+...+2^{10}\)

=>\(2E-E=\left(2+2^2+2^3+2^4+...+2^{10}\right)-\left(1+2+2^2+2^3+...+2^9\right)\)

=>\(E=2^{10}-1=1024-1=1023\)