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

Toán Lớp 8: (x+5)(3x+2)^2=x^2(x+5) giair pt tieeps nhaaa

Toán Lớp 8: (x+5)(3x+2)^2=x^2(x+5)
giair pt tieeps nhaaa

Comments ( 2 )

  1. Giải đáp và giải thích các bước giải:
    ~kam~ 

    toan-lop-8-5-3-2-2-2-5-giair-pt-tieeps-nhaaa

  2. ***Lời giải***
    (x+5)(3x+2)^2=x^2(x+5)
    <=>(x+5)(3x+2)^2-x^2(x+5)=0
    <=>(x+5)[(3x+2)^2-x^2]=0
    <=>(x+5)(3x+2-x)(3x+2+x)=0
    <=>(x+5)(2x+2)(4x+2)=0
    <=>4(x+5)(x+1)(2x+1)=0
    <=>(x+5)(x+1)(2x+1)=0
    <=>\(\left[ \begin{array}{l}x+5=0\\x+1=0\\2x+1=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=-5\\x=-1\\2x=-1\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=-5\\x=-1\\x=\dfrac{-1}{2} \end{array} \right.\) 
    Vậy S={-5;-1;-1/2}

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