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

Toán Lớp 9: x – 3√x – 4 = 0 làm giúp mik cái ạ

Toán Lớp 9: x – 3√x – 4 = 0
làm giúp mik cái ạ

Comments ( 2 )

  1. x-3sqrt{x}-4=0
    Điều kiện:x>=0
    =>x+sqrt{x}-4sqrt{x}+4=0
    =>sqrt{x}(sqrt{x}+1)-4(sqrt{x}+1)=0
    =>(sqrt{x}-1)(sqrt{x}-4)=0
    =>\(\left[ \begin{array}{l}\sqrt{x}-1=0\\\sqrt{x}-4=0\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}\sqrt{x}=1\\\sqrt{x}=4\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=1\text{(thỏa mãn)}\\x=2\text{(thỏa mãn)}\end{array} \right.\) 
    Vậy S={1;2}.

  2. x – 3√x – 4 = 0
    ĐKXĐ: 
    =0
     
    nên 
     

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

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