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

Toán Lớp 6: (8705+5235)-5x=3885 2 mũ 2016.2 mũ x -1=2 mũ 2015

Toán Lớp 6: (8705+5235)-5x=3885
2 mũ 2016.2 mũ x -1=2 mũ 2015

Comments ( 2 )

  1. Answer
    (8705 + 5235) – 5x = 3885
    => 13940 – 5x = 3885
    => 5x = 13940 – 3885
    => 5x = 10055
    => x = 10055 : 5
    => x = 2011
    Vậy x = 2011
    ___________________________
    2^2016 . 2^{x – 1} = 2^2015
    => 2^{2016 + x – 1} = 2^2015
    => 2016 + x – 1 = 2015
    => x + (2016 – 1) = 2015
    => x + 2015 = 2015
    => x = 2015 – 2015
    => x = 0
    Vậy x = 0

  2. Lời giải và giải thích chi tiết:
    (8705 + 5235)-5x=3885
    ⇒13945-5x=3885
    ⇒5x=13945-3885
    ⇒5x=10055
    ⇒x=10055 : 5
    ⇒x=2011
    Vậy  x=2011
    ———————————-
    2^2016 . 2^{x-1} = 2^2015
    ⇒2^{2016 + x-1} = 2^2015
    ⇒ 2016 +x-1=2015
    ⇒ 2015 +x =2015
    ⇒x=2015 – 2015
    ⇒x=0
    Vậy   x=0

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