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

Toán Lớp 6: Sợ sánh: a= 14^2018-14^2017 và b= 14^2017-14^2016 Giúp mình nha

Toán Lớp 6: Sợ sánh: a= 14^2018-14^2017 và b= 14^2017-14^2016
Giúp mình nha

Comments ( 2 )

  1. Ta có:
    a = 14^2018 – 14^2017
    a = 14^2017 . 14 – 14^2017
    a = 14^2017 . (14 – 1)
    a = 14^2017 . 13
    b = 14^2017 – 14^2016
    b = 14^2016 . 14 – 14^2016
    b = 14^2016 . (14 – 1)
    b = 14^2016 . 13
    Vì: 14^2017 . 13 > 14^2016 . 13
    => a > b
    Vậy a > b

  2. a = 14^2018 – 14^2017
    = 14^2016 ( 14^2 – 14 )
    = 14^2016 ( 196 – 14 ) = 14^2016 . 182
    b = 14^2017 – 14^2016
    = 14^2016 ( 14 – 1 ) = 14^2016 . 13
    ⇔ a > b

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

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