2100 - 299 - 298 - ... - 2 - 1 = 2100 - ( 299 + 298 + ... + 2 + 1 )

= 2100 - { ( 299 + 1 ) . [ ( 299 - 1) : 1 + 1 ] : 2 }

= 2100 - { 300 . 299 :2 }

= 2100 - 22425

= -20325

Ta có: \(A=2^{100}-2^{99}-2^{98}-...-2^2-2-1\)

\(\Leftrightarrow2A=2^{101}-2^{100}-2^{99}-...-2^3-2^2-2\)

\(\Leftrightarrow2A-A=2^{101}-2^{100}-2^{99}-...-2^3-2^2-2-2^{100}+2^{99}+2^{98}+...+2^2+2+1\)

\(\Leftrightarrow A=2^{101}-2\cdot2^{100}+1\)

\(\Leftrightarrow A=1\)

Thank you

\(A=2^{100}-\left(2^{99}+2^{98}+...+2+1\right)\)

Đặt \(B=2^{99}+2^{98}+...+2+1\)

\(\Rightarrow2B=2^{100}+2^{99}+...+2^2+2\)

\(\Rightarrow2B-B=2^{100}-1\Leftrightarrow B=2^{100}-1\)

\(\Rightarrow A=2^{100}-\left(2^{100}-1\right)=1\)

\(A=2^{100}-2^{99}+2^{98}-2^{97}+....-2^3+2^2-2+1\\ A=\left(2^{100}+2^{98}+...+2\right)-\left(2^{99}+2^{97}+...+1\right)\)

Gọi \(\left(2^{100}+2^{98}+...+2\right)\)là B

\(B=\left(2^{100}+2^{98}+...+2\right)\\ 2B=2^{102}+2^{100}+.....+2^2\\ 2B-B=\left(2^{102}+2^{100}+.....+2^2\right)-\left(2^{100}+2^{98}+...+2\right)\\ B=2^{102}-2\)

Gọi \(\left(2^{99}+2^{97}+...+1\right)\) là C

\(C=\left(2^{99}+2^{97}+...+1\right)\\ 2C=2^{101}+2^{99}+....+2\\ 2C-C=\left(2^{101}+2^{99}+9^{97}+...+2\right)-\left(2^{99}+9^{97}+...+1\right)\\ C=2^{101}-1\)

\(A=B+C\\ =>A=2^{102}-2+2^{101}-1\\ A=2^{101}\left(2+1\right)-3\\ A=2^{101}\cdot3-3\\ A=3\cdot\left(2^{101}-1\right)\)

\(\dfrac{1}{2}A=2^{99}-2^{98}+...-1+\dfrac{1}{2}\\ \Rightarrow A-\dfrac{1}{2}A=2^{100}-\dfrac{1}{2}\\ \Rightarrow A=2^{101}-1\)

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

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

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

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

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

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

cho mk hỏi câu lớp mấy vậy bn

lớp 6 bn ak

chẳng có qui luật gì cả. 1, 2, 3, 4...,298, 299 rồi sau đó là 2100 chẳng hợp gì cả

\(A=2+2^2+2^3+2^4+...+2^{99}+2^{100}\)

\(\Rightarrow2A=2^2+2^3+2^4+...+2^{100}+2^{101}\)

\(\Rightarrow A=2A-A=2^2+2^3+2^4+...+2^{100}+2^{101}-2-2^2-2^3-2^4-...-2^{99}-2^{100}=2^{101}-2\)

giúp minh