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

Toán Lớp 8: 4x^2]-25-(2x-5)(4x+7)=0 jup em ấp e cho 5 sao ạ

Toán Lớp 8: 4x^2]-25-(2x-5)(4x+7)=0 jup em ấp e cho 5 sao ạ

Comments ( 1 )

  1. 4x^2-25-(2x-5)(4x+7)=0
    ⇔(2x-5)(2x+5)-(2x-5)(4x+7)=0
    ⇔(2x-5)(2x+5-4x-7)=0
    ⇔(2x-5)(-2x-2)=0
    ⇔-2(2x-5)(x+1)=0
    ⇔\(\left[ \begin{array}{l}2x-5=0\\x+1=0\end{array} \right.\) 
    ⇔\(\left[ \begin{array}{l}x=\dfrac{5}{2}\\x=-1\end{array} \right.\) 
    Vậy x=5/2 hoặc x=-1
     

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

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