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 ( x + 1 )^3 – ( x – 1 ) . (x^2 + x + 1 ) – 2 = 0

Toán Lớp 8: Tìm x
( x + 1 )^3 – ( x – 1 ) . (x^2 + x + 1 ) – 2 = 0

Comments ( 2 )

  1. \text{Giải đáp:}
    $\left[\begin{matrix} x=0\\ x=-1\end{matrix}\right.$
    \text{Lời giải và giải thích chi tiết:}
     (x+1)^3-(x-1)(x^2+x+1)-2=0
    ⇔x^3+3x^2+3x+1-x^3+1-2=0
    ⇔3x^2+3x=0
    ⇔3x(x+1)=0
    ⇔ $\left[\begin{matrix} 3x=0\\ x+1=0\end{matrix}\right.$ ⇔ $\left[\begin{matrix} x=0\\ x=-1\end{matrix}\right.$
    \text{Vậy…}

  2.    $(x+1)^{3}$-$(x-1)(x^2+x+1)^{}$ – $2=0^{}$ 
    ⇔$x^3+3x^2+3x+1^{}$ – $x^{3}$ + $1^{}$ – $2=0^{}$ 
    ⇔$3x^2+3x=0^{}$ 
    ⇔$3x(x+1)=0^{}$ 
    ⇔\(\left[ \begin{array}{l}3x=0\\x+1=0\end{array} \right.\) 
    ⇔\(\left[ \begin{array}{l}x=0\\x=-1\end{array} \right.\) 

Leave a reply

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

About Bình