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

Toán Lớp 7: (1/5-3/2 x)^2=9/4 (tìm x nha mn )

Toán Lớp 7: (1/5-3/2 x)^2=9/4
(tìm x nha mn )

Comments ( 2 )

  1. (1/5 – 3/2x)² = 9/4
    ⇔1/5 – 3/2x = ±3/2
    ⇔-3/2x = ±3/2 – 1/5
    ⇔-3/2x = 13/10 hoặc -3/2x = -17/10
    ⇔-x = 13/10 × 2/3 hoặc -x = -17/10 × 2/3
    ⇔x = -13/15 hoặc x = 17/15
     

  2. Giải đáp + Lời giải và giải thích chi tiết:
    (1/5-3/2 x)^2=9/4
    TH1: (1/5-3/2 x)^2=(3/2)^2
    1/5 – 3/2x = 3/2
    -3/2x = 3/2 – 1/5
    -3/2x = 13/10
    x = -13/15
    TH2: (1/5-3/2 x)^2=(-3/2)^2
    1/5 – 3/2x = -3/2
    -3/2x = -3/2 – 1/5
    -3/2x = -17/15
    x = 17/15
    Vậy x ∈ {17/15; -13/15}

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

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