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

Toán Lớp 8: Tìm x 1. 4x ( x-3) – (2x-5)^2=-1

Toán Lớp 8: Tìm x
1. 4x ( x-3) – (2x-5)^2=-1

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    $ 4x ( x-3) – (2x-5)^2=-1\\4x^2-12x-4x^2+20x-25=-1\\8x-25=-1\\8x=24 \\x=3$

  2. 1)
    4x(x – 3) – (2x – 5)^2 = -1
    ⇔ 4x^2 – 12x – (4x^2 – 10x – 10x + 25) = -1
    ⇔ 4x^2 – 12x – (4x^2 – 20x + 25) = -1
    ⇔ 4x^2 – 12x – 4x^2 + 20x – 25 = -1
    ⇔ 8x = -1 + 25 = 24
    ⇔ x = 3
    Vậy  x = 3

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

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