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 9: giải phương trình sau a.4x ² – x = 0 b.x-3x ²=0 c.4x ² -36=0

Toán Lớp 9: giải phương trình sau
a.4x ² – x = 0
b.x-3x ²=0
c.4x ² -36=0

Comments ( 1 )

  1. 4x^2-x=0
    <=>x(4x-1)=0
    <=>\(\left[ \begin{array}{l}x=0\\4x-1=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=0\\x=\dfrac{1}{4}\end{array} \right.\) 
    Vậy S={0;1/4}
    x-3x^2=0
    <=>x(1-3x)=0
    <=>\(\left[ \begin{array}{l}x=0\\1-3x=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=0\\x=\dfrac{1}{3}\end{array} \right.\) 
    Vậy S={0;1/3}
    4x^2-36=0
    <=>(2x-6)(2x+6)=0
    <=>\(\left[ \begin{array}{l}2x-6=0\\2x+6=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=3\\x=-3\end{array} \right.\) 
    Vậy S={±3}

Leave a reply

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

About Madelyn