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: x^(4)-5x^(3)+x^(2)-5x=0 Tìm x .

Toán Lớp 8: x^(4)-5x^(3)+x^(2)-5x=0
Tìm x .

Comments ( 2 )

  1. x^4-5x^3+x^2-5x=0
    ⇔x^3(x-5)+x(x-5)=0
    ⇔(x-5)(x^3+x)=0
    ⇔x(x-5)(x^2+1)=0
    ⇔x=0
    x-5=0⇒x=5
    x^2+1=0⇒x^2=-1⇒x không có giá trị
    Vậy x=0 hoặc x=5 thoả mãn bài toán

  2. #huy
    x^(4)-5x^(3)+x^(2)-5x=0
    <=>x^3(x-5)+x(x-5)=0
    <=>(x-5)(x^3+x)=0
    <=>x(x-5)(x^2+1)=0
    <=>x=0
    <=>\(\left[ \begin{array}{l}x-5=0\\x^2+1=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=5\\x=0\end{array} \right.\) 
    Vậy x=0 hoặc x-5

Leave a reply

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

About Linh