Question

\(1+2+2^2+2^3+...+2^{19}-2^{20}\)

 BIẾT 1 ĐẾN 2¹⁹ CÓ 20 SH

Answer 1

Merry Christmas

Answer 2

\(A=2^0+2^1+2^2+...+2^{19}-2^{20}\)

Dat \(M=2^0+2^1+2^2+...+2^{19}\)

\(\Rightarrow2M=2^1+2^2+2^3+...+2^{20}\)

\(\Rightarrow M=2M-M=2^{20}-1\)

\(\Rightarrow A=M-2^{20}=\left(2^{20}-1\right)-2^{20}=-1\)

Answer 3

Số 1 đâu bạn???

Answer 4

So 1 mk chuyen thanh 2^0 ban