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

Toán Lớp 9: √(x+2 √(x-1))=2 giúp e vs ạ

Toán Lớp 9: √(x+2 √(x-1))=2 giúp e vs ạ

Comments ( 2 )

  1. \sqrt{x+2\sqrt{x-1}}=2(x≥1)
    ⇔\sqrt{(\sqrt{x-1})^2+2.\sqrt{x-1}.1+1^2}=2
    ⇔\sqrt{(\sqrt{x-1}+1)^2}=2
    ⇔|\sqrt{x-1}+1|=2
    ⇔\sqrt{x-1}+1=2
    ⇔\sqrt{x-1}=1
    ⇔(\sqrt{x-1})^2=1^2
    ⇔x-1=1
    ⇔x=2(TM)
    Vậy S={2}
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
    \sqrt{x+2\sqrt{x-1}}=2(x>=1)
    <=>\sqrt{x-1+2\sqrt{x-1}+1}=2
    <=>\sqrt{(\sqrt{x-1}+1)^2}=2
    <=>|\sqrt{x-1}+1|=2
    <=>\sqrt{x-1}+1=2
    <=>\sqrt{x-1}=1
    <=>x-1=1
    <=>x=2(tm)
    Vậy S={2} 

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