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

Toán Lớp 9: Căn x – 3 căn x = – 6 giúp mình vs

Toán Lớp 9: Căn x – 3 căn x = – 6 giúp mình vs

Comments ( 2 )

  1. $\text{#Táo vàng}$
    \sqrt{x-3} . \sqrt{x} = -6
    \sqrt{x} . (\sqrt{x – 3}) = -6
    $\text{TH1:}$
    \sqrt{x} = -6
    => x \in \emptyset
    $\text{TH2:}$
    \sqrt{x – 3} = -6
    => x \in \emptyset
    $\text{Vậy}$ S = {\emptyset}
     

  2. Đk:x≥0
    x- 3$\sqrt{x}$ = -6 
    $\sqrt{x}$($\sqrt{x}$ -3)=-6
    $\sqrt{x}$ = -6 ( vô lí ) hoặc $\sqrt{x}$ -3 =6 ⇔ $\sqrt{x}$ =9⇔x =81(TM)
    Vậy S={81}

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