A = 1+2^2+2^3+..+2^2010 Mới vô lớp 6 đang học trước nâng cao mong bày hộ

${A}$ = ${1}$+$2^{2}$+$2^{3}$+…+$2^{2010}$ 

${2A}$ = ${2}$ . ( ${1}$+$2^{2}$+$2^{3}$+…+$2^{2010}$ )

${2A}$ = ${2}$+$2^{3}$+$2^{4}$+…+$2^{2011}$ 

${2A}$ – ${A}$ = ( ${2}$+$2^{3}$+$2^{4}$+…+$2^{2011}$ ) – ( ${1}$+$2^{2}$+$2^{3}$+…+$2^{2010}$ )

${A}$ =  ${2}$+$2^{3}$+$2^{4}$+…+$2^{2011}$ – ${1}$-$2^{2}$-$2^{3}$-…-$2^{2010}$

${A}$ =  $2^{2011}$-${1}$

$\text{STUDY WELL!}$