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 7: l $x^{2}$ + lx-1 l l= $x^{2}$ +2 Làm hộ mình nha!

Toán Lớp 7: l $x^{2}$ + lx-1 l l= $x^{2}$ +2
Làm hộ mình nha!

Comments ( 2 )

  1. | x^2 + | x – 1 | | = x^2 + 2
    Ta có : x^2 + 2 > 0 ∀ x
    => | x^2 + | x – 1 | | > 0 ∀ x
    => x^2 + | x – 1 | = x^2 + 2
    => x^2 – x^2 + | x – 1 | = 2
    => | x – 1 | = 2
    ⇔ x – 1 = 2
    => x      = 3
    ⇔ x – 1 = -2
    => x      = -1
    Vậy x ∈ { 3; 1 }
     

Leave a reply

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

About Thảo