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

Toán Lớp 8: 1.5 :tìm x ko âm biết b, √x= √2 c, √x=-2

Toán Lớp 8: 1.5 :tìm x ko âm biết
b, √x= √2
c, √x=-2

Comments ( 2 )

  1. b)
    \sqrt{x} = \sqrt{2}
    ⇒ x = 2
    c)
    \sqrt{x} = -2
    text(Vô lí do) \sqrt{x} ≥ 0
    ⇒ x = ∅

  2. Giải đáp:
    b. \sqrt{x}=\sqrt{2}
    <=> (\sqrt{x})^2=(\sqrt{2})^2
    <=> x=2
    Vậy S={2}
    c. \sqrt{x}=-2 (vô lý, \sqrt{x}\ge0 \forall x)
    => x\in∅
    Vậy S=∅

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