Question

\(A=2+2+2^2+2^3+2^4+...+2^{2017}+2^{2018}\)²⁰¹⁸

                   Help me!!!

Answer 1

ko có 2018 ở ngoài

Answer 2

lớp 1 đã học số mũ đâu nhỉ

Answer 3

\(2A=2^2+2^2+2^3+2^4+...+2^{2019}\\ 2A-A=2^{2019}+2^2-2-2\)

\(A=2^{2019}\)

Answer 4

Sửa đề chút:

\(A=1+2+2^2+2^3+...+2^{2018}\)

\(\Rightarrow2A=2+2^2+2^3+2^4+...+2^{2019}\)

\(\Rightarrow A=\left(2+2^2+2^3+2^4+...+2^{2019}\right)-\left(1+2+2^2+2^3+...+2^{2018}\right)\)

\(\Rightarrow A=2+2^2+2^3+2^4+...+2^{2019}-1-2-2^2-2^3-...-2^{2018}\)

\(\Rightarrow A=2^{2019}-1\)

~Std well~

Answer 5

A=2+2²+2³+2⁴+...+2²⁰¹⁷+2²⁰¹⁸

2A=2²+2³+2⁴+...+2²⁰¹⁷+2²⁰¹⁸+2²⁰¹⁹

2A-A=2²⁰¹⁹-1

A=2²⁰¹⁹-1