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

Toán Lớp 6: Bài 2: b). x² – [666:(24+13)]=7

Toán Lớp 6: Bài 2: b). x² – [666:(24+13)]=7

Comments ( 1 )

  1. x² – [666:(24+13)]=7
    ⇔ x² – (666 : 37) = 7
    ⇔ x² – 18 = 7
    ⇔ x² = 25
    ⇔ \(\left[ \begin{array}{l}x=5\\x=-5\end{array} \right.\) 
                                             Vậy x ∈ {5; -5}

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

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