Toán Lớp 6: S=1+2+2^3+2^5+…….+2^2019+2^2021
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Toán Lớp 6: S=1+2+2^3+2^5+…….+2^2019+2^2021
Comments ( 2 )
=>2^2S=1.2^2+2^3. 2^2+2^5. 2^2+…+2^2019. 2^2+2^2021. 2^2
=>4S=2^2+2^5+2^7+…+2^2021+2^2023
=>4S-S=(2^2+2^5+2^7+…+2^2021+2^2023)-(1+2+2^3+2^5+…….+2^2019+2^2021)
=>3S=2^2023-1
=>S=[2^2023-1]/3