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

Toán Lớp 8: Tìm x a, `(3x-4)^2 – (9x-2) . (x+1) = 0`

Toán Lớp 8: Tìm x
a, (3x-4)^2 – (9x-2) . (x+1) = 0

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    a, (3x-4)^2 – (9x-2)(x+1)=0
    <=> 9x^2 – 24x + 16 – 9x^2 – 9x + 2x+2=0
    <=> -31x+18=0
    <=> -31x=-18
    <=> x=18/31

  2. $\\$
    (3x-4)^2 – (9x – 2)(x+1)=0
    ⇔ (9x^2 – 24x + 16) – (9x^2 + 9x – 2x-2)=0
    ⇔ 9x^2 – 24x+ 16 – 9x^2 – 7x + 2=0
    ⇔ -31x + 18=0
    ⇔ -31x=-18
    ⇔x=18/31
    Vậy phương trình có tập nghiệm : S={18/31}

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

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