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

Toán Lớp 9: căn (2x-5)^2=11 mình cần gấp ạ

Toán Lớp 9: căn (2x-5)^2=11 mình cần gấp ạ

Comments ( 2 )

  1. $\sqrt{\left(2x-5\right)^2}=11$
    Áp dụng $\sqrt{A^2}=|A|$ ta có:
    $⇔ |2x-5|=11$
    $⇔ 2x-5 = 11$ hoặc $2x-5=-11$
    $⇔ 2x=16$ hoặc $2x=-6$
    $⇔ x=8$ hoặc $x=-3$
    Vậy $S=\{8;-3\}$

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