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 8: Tìm x: (3x – 5)(7 – x) + (5x + 2)(3x – 2) – 2 = 0

Toán Lớp 8: Tìm x: (3x – 5)(7 – x) + (5x + 2)(3x – 2) – 2 = 0

Comments ( 1 )

  1. $(3x-5)(7-x)+(5x+2)(3x-2)-2=0^{}$
    ⇔ $21x^{}-3x^2-35+5x+15x^2-10x+6x-4-2=0$ 
    ⇔ $12x^{2}+22x-41$ 
    ⇔ \(\left[ \begin{array}{l}x=\dfrac{-11+\sqrt[]{613}}{12}\\x=\dfrac{-11-\sqrt[]{613}}{12}\end{array} \right.\)  
    Bạn xem lại đề đi ạ chứ số xấu lắm .
    Chúc bạn học tốt !!!!!

Leave a reply

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