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: Số hữu tỉ x thỏa mãn / 2x -1/ > / -3/4 /

Toán Lớp 7: Số hữu tỉ x thỏa mãn / 2x -1/ > / -3/4 /

Comments ( 2 )

  1. $|2x-1|>\left|-\dfrac34\right|$
    \(⇔ \left[ \begin{array}{l}2x-1>\dfrac34\\2x-1>-\dfrac34\end{array} \right.\) 
    \(⇔ \left[ \begin{array}{l}2x>\dfrac74\\2x>\dfrac14\end{array} \right.\) 
    \(⇔ \left[ \begin{array}{l}x>\dfrac78\\x>\dfrac18\end{array} \right.\) 

  2. TH1:|2x-1|>|-3/4|
    2x-1>3/4
    2x-1-3/4>0
    2x-7/4>0
    =>2x>7/4
    =>x>7/8
    ________________
    TH2:|2x-1|>|-3/4|
    2x-1>-3/4
    2x-[1-(-3/4)]>0
    2x-1/4>0
    =>2x>1/4
    =>x>1/8

Leave a reply

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