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: a)x+5=-6 b)[x+3]=5 c)(x-3).(x-16)=0

Toán Lớp 7: a)x+5=-6
b)[x+3]=5
c)(x-3).(x-16)=0

Comments ( 2 )

  1. Câu a)
    $\text{x + 5 = -6}$
    $\text{x = – 6 – 5}$
    $\text{x = -11}$
    Câu b)
    $\text{[x + 3] = 5}$
    $\text{x + 3 = 5}$
    $\text{x = 5 +3}$
    $\text{x = 8}$
    Câu c)
    $\text{( x – 3 ) .(x – 16) =0}$
    $\text{x – 3 = 0 hoặc x -16 =0(để (x – 3).(x – 16)= 0}$
    $\text{=> x = 3 hoặc 16}$
    $\text{Vậy x ∈ {3 ;16 }}$

  2. a) x + 5 = -6
        x = -6 – 5
        x = -11
    b) |x + 3| = 5
    => x + 3 in {5; -5}
    => x in {2; -8}
    c) (x – 3).(x – 16) = 0
    => x – 3 = 0 hoặc x – 16 = 0
    => x = 3 hoặc x = 16
    => x in {3; 16}
     

Leave a reply

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