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

Toán Lớp 6: Cho ạ=1+3+3²+3³+…+3²⁰ chứng tỏ S:13

Toán Lớp 6: Cho ạ=1+3+3²+3³+…+3²⁰ chứng tỏ S:13

Comments ( 2 )

  1.  A=1+3+3^2+3^3+….+3^20
    =(1+3+3^2)+3^3 (1+3+3^2) + …. + 3^18 (1+3+3^2)
    =13+3^3 . 13 + … + 3^18 .13\ vdots 13
    Vậy ta có điều phải chứng minh.

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

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