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

Toán Lớp 8: 1. 4x (x-5)-(x-1) (4x-3)=5 2. (3x-4) (x-2)=3x(x-9)-3 GIÚP MIK VỚI Ah

Toán Lớp 8: 1. 4x (x-5)-(x-1) (4x-3)=5
2. (3x-4) (x-2)=3x(x-9)-3
GIÚP MIK VỚI Ah

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    1)
    4x(x-5)-(x-1)(4x-3)=5
    ⇔4x^(2)-20x-4x^(2)+3x+4x-3=5
    ⇔-13x-3=5
    ⇔-13x=5+3
    ⇔x=-8/13
    Vậy x=-8/13
    2)
    (3x-4)(x-2)=3x(x-9)-3
    ⇔3x^(2)-6x-4x+8=3x^(2)-27x-3
    ⇔3x^(2)-10x+8-3x^(2)+27x+3=0
    ⇔17x=-11
    ⇔x=-11/17
    Vậy x=-11/17
    #Study well

  2. a)
    4x(x – 5) – (x – 1)(4x – 3) = 5
    ⇔ 4x^2 – 20x – (4x^2 – 7x + 3) = 5
    ⇔ 4x^2 – 20x – 4x^2 + 7x – 3  = 5
    ⇔ -13x = 8
    ⇒ x = -8/13
    b)
    (3x – 4)(x – 2) = 3x(x – 9) – 3
    ⇔ 3x^2 – 10x + 8 = 3x^2 – 27x – 3
    ⇔ 3x^2 – 3x^2 – 10x + 27x = -3 – 8
    ⇔ 17x = -11
    ⇒ x = -11/17

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

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