Question

[❖ Khang/GD❄ 『ʈєɑɱ❖Hoàng๖ۣۜGia☆』]

a, A= 2¹⁰⁰ -  2⁹⁹ - 2⁹⁸ - 2⁹⁷ - ... - 2 - 

Answer 1

[Tử Nguyệt Hàn]

tham khảo 
https://olm.vn/hoi-dap/tim-kiem?q=A=2100-299-298-297-.........-22-2-1+.+t%C3%ADnh+A&id=52301

Answer 2

[Lấp La Lấp Lánh]

\(A=2^{100}-2^{99}-2^{98}-...-2\)

\(\Rightarrow-2A=-2^{101}+2^{100}+2^{99}+...+2^2\)

\(\Rightarrow A-2A=2^{100}-2^{99}-...-2-2^{101}+2^{100}+...2^2\)

\(\Rightarrow-A=2^{100}+2^{100}-2^{101}-2\)

\(\Rightarrow-A=-2\Rightarrow A=2\)