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: |9-7x|=5x-3 KHÔNG SAO CHÉP MẠNG

Toán Lớp 7: |9-7x|=5x-3
KHÔNG SAO CHÉP MẠNG

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
      |9 – 7x| = 5x – 3
    -> \(\left[ \begin{array}{l}9 – 7x = 5 x – 3\\9 – 7x = – 5x + 3\end{array} \right.\) 
    -> \(\left[ \begin{array}{l}-7x – 5x = -3 – 9\\-7 x + 5x = 3 – 9 \end{array} \right.\) 
    -> \(\left[ \begin{array}{l}-12x = -12\\-2x = -6\end{array} \right.\) 
    -> \(\left[ \begin{array}{l}x = 1\\x=3\end{array} \right.\) 

  2. |9 – 7x| = 5x – 3
    TH1:
    9 – 7x = 5x – 3
    5x + 7x = 9 + 3
    12x = 12
    x = 1
    TH2:
    9 – 7x = -5x – 3
    2x = 6
    x = 3
    → Vậy x = 1 hoặc x = 3

Leave a reply

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

About Mai