Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 8: tìm x biết (x-1)^2018=(x-1)^2020

Toán Lớp 8: tìm x biết (x-1)^2018=(x-1)^2020

Comments ( 2 )

  1. (x-1)^2018=(x-1)^2020
    =>(x-1)^2018-(x-1)^2020=0
    =>(x-1)^2018×[1-(x-1)²]=0
    TH1 : (x-1)^2018=0
    =>x-1=0
    =>x=1
    TH2 : 1-(x-1)²=0
    =>(x-1)²=1
    => x-1=1
    => x=2
    Vậy x=1 hoặc x= 2
    Chúc bạn học tốt 
    Xin ctlhn . Thank you

  2. Giải đáp:
    $(x-1)^{2018}$ $=$ $(x-1)^{2020}$ 
    $⇔$ $(x-1)^{2020}$ $-$ $(x-1)^{2018}=0$
    $⇔$ $(x-1)^{2020-2018}=0$
    $⇔$ $(x-1)^{2}=0$
    $⇔$ $x-1=0$
    $⇔$ $x=1$
    $Vậy$ $x=1$ 

Leave a reply

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