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

Toán Lớp 9: ( 2 \sqrt{ x } +1 ) ( \sqrt{ x } -2 ) = 7

Toán Lớp 9: ( 2 \sqrt{ x } +1 ) ( \sqrt{ x } -2 ) = 7

Comments ( 2 )

  1. #huy
    ( 2 \sqrt{ x } +1 ) ( \sqrt{ x } -2 ) = 7(x>=0)
    <=>2x+\sqrt{x}-4\sqrt{x}-2=7
    <=>2x-3\sqrt{x}-9=0
    <=>2x-6\sqrt{x}+3\sqrt{x}-9=0
    <=>2x.(\sqrt{x}-3)+3.(sqrt{x}-3)=0
    <=>(2\sqrt{x}+3)(\sqrt{x}-3)=0
    <=>[(2\sqrt{x}+3=0),(\sqrt{x}-3=0):}
    <=>[(2\sqrt{x}=-3),(\sqrt{x}=3):}
    <=>[(\sqrt{x}=(-3)/2(L)),(x=9(N)):}
    Vậy x=9
     

  2. Đề bài : ${( 2 \sqrt{ x } +1 ) ( \sqrt{ x } -2 ) = 7}$
     

    toan-lop-9-2-sqrt-1-sqrt-2-7

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