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

Toán Lớp 6: 3^2011-3^2010+-..+3^4-3^3+3^2-3 giup mik vs

Toán Lớp 6: 3^2011-3^2010+……+3^4-3^3+3^2-3
giup mik vs

Comments ( 2 )

  1. Giải đáp:
    Đặt A = 3^2011 – 3^2010 + ……… + 3^4 – 3^3 + 3^2 – 3
    3A = 3^2012 – 3^2011 + 3^2010 – ………. – 3^4 + 3^3 – 3^2
    3A + A = (3^2012  – 3^2011 + 3^2010 – ……. – 3^4 + 3^3 – 3^2) – (3^2011 – 3^2010 + ………. – 3^3 + 3^2 – 3)
    4A        = 3^2012 – 3
    A         = (3^2012 – 3)/4
     

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

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