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

Toán Lớp 6: Giải chi tiết giúp mình với nhé mọi người! (x + 3)(x – 5) = 0 (5x – 10)(3x + 6) = 0 (x – 4)(2x – 14) = 0

Toán Lớp 6: Giải chi tiết giúp mình với nhé mọi người!
(x + 3)(x – 5) = 0
(5x – 10)(3x + 6) = 0
(x – 4)(2x – 14) = 0

Comments ( 2 )

  1. Giải đáp:
    (x + 3)(x – 5) = 0
    =>\(\left[ \begin{array}{l}x+3=0\\x-5=0\end{array} \right.\) \(\left[ \begin{array}{l}x=0-=>3\\x=0+5\end{array} \right.\) =>\(\left[ \begin{array}{l}x=-3\\x=5\end{array} \right.\) 
    vậy x thuộc {-3;5}
    (5x – 10)(3x + 6) = 0
    =>\(\left[ \begin{array}{l}5x-10=0\\x=3x+6=0\end{array} \right.\)=>\(\left[ \begin{array}{l}5x=0+10\\3x=0-6\end{array} \right.\)=>\(\left[ \begin{array}{l}5x=10\\3x=-6\end{array} \right.\)=>\(\left[ \begin{array}{l}x=2\\x=-2\end{array} \right.\)
    vậy x thuộc {2;-2}
    (x – 4)(2x – 14) = 0
    =>\(\left[ \begin{array}{l}x-4=0\\2x-14=0\end{array} \right.\) =>\(\left[ \begin{array}{l}x=0+4\\2x=0+14\end{array} \right.\) =>\(\left[ \begin{array}{l}x=4\\2x=14\end{array} \right.\) => \(\left[ \begin{array}{l}x=4\\x=7\end{array} \right.\) 
    vậy x thuộc {4;7}
     xin CTLHN

  2. Giải đáp:
     $(x+3).(x-5)=0$
    $⇔$ \(\left[ \begin{array}{l}x+3=0\\x-5=0\end{array} \right.\) $⇔$  \(\left[ \begin{array}{l}x=-3\\x=5\end{array} \right.\) 
    $\text{Vậy x ∈ {-3;5}}$
    $b) (5x-10).(3x+6)=0$
    $⇔$ \(\left[ \begin{array}{l}5x-10=0\\3x+6=0\end{array} \right.\) $⇔$  \(\left[ \begin{array}{l}5x=10\\3x=-6\end{array} \right.\) $⇔$  \(\left[ \begin{array}{l}x=2\\x=-2\end{array} \right.\) 
    $\text{Vậy x ∈ {±2}}$
    $c) (x-4).(2x-14)=0$
    $⇔$ \(\left[ \begin{array}{l}x-4=0\\2x-14=0\end{array} \right.\) $⇔$  \(\left[ \begin{array}{l}x=4\\2x=14\end{array} \right.\) $⇔$  \(\left[ \begin{array}{l}x=4\\x=7\end{array} \right.\) 
    $\text{Vậy x ∈ {4;7}}$
     

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

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