minh cung lop 6 ma minh chua hoc den
k nha thanks
M = 22 + 22 + 23 + 24 + 25 + ... + 22019 + 22020
M - 22 = 22 + 23 + 24 + 25 + ... + 22019 + 22020
2M - 4 = 2(22 + 23+ 24 + 25 + ... + 22019 + 22020
2M - 4 = 23 + 24 + 25 + 26 + ... + 22020 + 22021
2M - M - 4 = (23 + 24 + 25 + 26 + ... + 22020 + 22021) - (22 + 23 + 24 + 25 + ... + 22019 + 22020)
M - 4 = 22021 - 22
M = (22021 - 22) + 4
M = 22021
<br class="Apple-interchange-newline"><div></div>2M= \(2^3+2^3+2^4+2^5+2^6+...+2^{2020}+2^{2021}\)
\(-\)
<br class="Apple-interchange-newline"><div></div>M=22+22+23+24+25+..........+22019+22020
\(M=2^{2021}-\left(2^2+2^2\right)\)
Vậy \(M=2^{2021}-\left(2^2+2^2\right)\)