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

Toán Lớp 8: 5x(x-4) -7 (x-4) =0 giúp e vs ạ

Toán Lớp 8: 5x(x-4) -7 (x-4) =0 giúp e vs ạ

Comments ( 2 )

  1. 5x(x-4) -7 (x-4) =0
    ⇔ (x-4)(5x-7)=0
    ⇔ x – 4 = 0 hoặc 5x – 7 = 0
    ⇔ x = 4 hoặc 5x = 7
    ⇔ x = 4 hoặc x = 7/5
     

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

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