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: Thực hiên phép tính a) (2x+1)^2+(2x-1)^2-2.(2x+1).(2x-1) Giúp mình nha

Toán Lớp 8: Thực hiên phép tính
a) (2x+1)^2+(2x-1)^2-2.(2x+1).(2x-1)
Giúp mình nha

Comments ( 2 )

  1. a) (2x+1)^2+(2x-1)^2-2.(2x+1).(2x-1)
    = ( 2x+1)^2 – 2.(2x+1)(2x-1) + (2x-1)^2 
    = [ (2x+1) – (2x-1) ]^2 
    = ( 2x +1 – 2x + 1 )^2 
    = 2^2 = 4
     

Leave a reply

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