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

Toán Lớp 6: (X-6)²-(-3)²=-5 Dạ em cảm ơn ạ

Toán Lớp 6: (X-6)²-(-3)²=-5
Dạ em cảm ơn ạ

Comments ( 2 )

  1. Giải đáp:
     $(x-6)²-(-3)²=-5$
    $⇔ (x-6)²= (-5)+9$
    $⇔ (x-6)²=-4$
    $⇔ (x-6)²=(-2)²$
    $\text{* Xét 2 TH:}$
    $\text{+) TH1: x-6=2}$
    $⇔x= 2+6$
    $⇔x=8$
    $\text{+) TH2: x-6=-2}$
    $⇔ x= (-2)+6$
    $⇔ x=4$
    $Vậy$ $x=8$ $hoặc$ $x=4$
     

  2. Lời giải chi tiết:
    (x-6)^2-(-3)^2=-5
    =>(x-6)^2-9=-5
    =>(x-6)^2=-5+9
    =>(x-6)^2=4
    =>\(\left[ \begin{array}{l}(x-6)^2=2^2\\(x-6)^2=(-2)^2\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x-6=2\\x-6=-2\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=2+6\\x=-2+6\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=8\\x=4\end{array} \right.\)
    Vậy x=8 hoặc x=4

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

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