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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Tính tổng sau theo dãy quy luật B=1+5+5 mũ 2 +-+5 mũ 2021

Toán Lớp 6: Tính tổng sau theo dãy quy luật
B=1+5+5 mũ 2 +….+5 mũ 2021

Comments ( 2 )

  1. B=1+5+5^2+. . .+5^2021
    5B=5+5^2+5^3+. . .+5^2022
     5B-B=(5+5^2+. . .+5^2022)-(1+5+. . .+5^2021)
    4B=5^2022-1
    B=$\dfrac{5^{2022}-1}{4}$ 

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222-9+11+12:2*14+14 = ? ( )