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 6: b) – 4x – 100 : 20 = 19. c) (x – 23) . (14 + x) = 0.

Toán Lớp 6: b) – 4x – 100 : 20 = 19.
c) (x – 23) . (14 + x) = 0.

Comments ( 2 )

  1. b, -4x – 100 : 20 = 19
                  -4x – 5 = 19
                       -4x = 19 + 5
                       -4x = 24 
                          x = 24 : (-4)
                          x = -6
    c, (x – 23) . (14 + x) =0
                         x – 23 = 0 hoặc 14 + x = 0
                                 x = 0 + 23         x = 0 – 14
                                 x = 23               x = -14
                          ⇒ $x_{1}$ = 23 ; $x_{2}$ = -14
     

  2. b ) -4x – 100 : 20 = 19
    => -4x – 5 = 19
    => -4x = 19 + 5
    => -4x = 24
    => x = 24 : (-4)
    => x = -6
    Vậy x = -6
    c ) (x – 23) . (14 + x) = 0
    =>\(\left[ \begin{array}{l}x – 23=0\\14 + x = 0\end{array} \right.\) 
     =>\(\left[ \begin{array}{l}x = 23 \\x = -14\end{array} \right.\) 
    Vậy x ∈ {23 ; -14}
    #dtkc

Leave a reply

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

About Melanie