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

Toán Lớp 9: 2 căn 3x – 3 căn 12x +5 căn 27 x =33

Toán Lớp 9: 2 căn 3x – 3 căn 12x +5 căn 27 x =33

Comments ( 2 )

  1. 2\sqrt{3x}-3\sqrt{12x}+5\sqrt{27x}=33(x>=0)
    <=>2\sqrt{3x}-3\sqrt{2^2 .3x}+5\sqrt{3^2 .3x}=33
    <=>2\sqrt{3x}-6\sqrt{3x}+15\sqrt{3x}=33
    <=>\sqrt{3x}(2-6+15)=33
    <=>11\sqrt{3x}=33
    <=>\sqrt{3x}=3
    <=>3x=9
    <=>x=3(tm)
    Vậy S={3}

  2. Giải đáp+Lời giải và giải thích chi tiết:
    2\sqrt{3x}-3\sqrt{12x}+5\sqrt{27x}=33(x≥0)
    ⇔2\sqrt{3x}-3\sqrt{4.3x}+5\sqrt{9.3x}=33
    ⇔2\sqrt{3x}-6\sqrt{3x}+15\sqrt{3x}=33
    ⇔11\sqrt{3x}=33
    ⇔\sqrt{3x}=3
    ⇔3x=9
    ⇔x=3(tm)
    Vậy S={3}
     

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

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