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

Toán Lớp 8: Tìm x a) x + 1 = ( x + 1 ) mũ 2 b) ( x mũ 3 – 4x mũ 2 ) – ( x – 4) =0

Toán Lớp 8: Tìm x
a) x + 1 = ( x + 1 ) mũ 2
b) ( x mũ 3 – 4x mũ 2 ) – ( x – 4) =0

Comments ( 2 )

  1. Giải đáp:
    a, (x+1)^2 = x+1
    -> (x+1)^2 – (x+1) = 0
    -> (x+1) . [(x+1) – 1] = 0
    -> $\left[\begin{matrix} x+1=0\\ (x+1) – 1 = 0\end{matrix}\right.$
    -> $\left[\begin{matrix} x=-1\\ x+1 = 1\end{matrix}\right.$
    -> $\left[\begin{matrix} x=-1\\ x=0\end{matrix}\right.$
    Vậy $\left[\begin{matrix} x=-1\\ x=0\end{matrix}\right.$
    b, (x^3 – 4x^2)-(x-4) = 0
    -> x^3 – 4x^2 – (x – 4) = 0
    -> x^2.(x-4) – (x-4) = 0
    -> (x-4).(x^2-1) = 0
    -> $\left[\begin{matrix} x-4=0\\ x^2 – 1=0\end{matrix}\right.$
    -> $\left[\begin{matrix} x=4\\ x^2 = 1\end{matrix}\right.$
    -> $\left[\begin{matrix} x=4\\ x=±1\end{matrix}\right.$
    Vậy $\left[\begin{matrix} x=4\\ x=±1\end{matrix}\right.$
     

  2. Giải đáp+ giải thích các bước làm :
     Chúc bạn học tốt nhé!!

     
     

    toan-lop-8-tim-a-1-1-mu-2-b-mu-3-4-mu-2-4-0

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

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