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

Toán Lớp 8: 3/1-4x = 2/4x+1 – 8+6x/16x^2-4 giúp gấp mn ơi

Toán Lớp 8: 3/1-4x = 2/4x+1 – 8+6x/16x^2-4 giúp gấp mn ơi

Comments ( 2 )

  1. Giải đáp:
    $x = \dfrac{1}{2}$
    Lời giải và giải thích chi tiết:
     

    toan-lop-8-3-1-4-2-4-1-8-6-16-2-4-giup-gap-mn-oi

  2.  3/(1 – 4x) = 2/(4x + 1) – (8 + 6x)/(16x^2 – 4) ( đk x $\neq$ ± 1/4)
    ⇔ 3/(4x – 1) = 2/(4x + 1) – (8 + 6x)/((4x+1)(4x-1)) 
    ⇔2/(4x+1) + 3/(4x – 1) –  (8 + 6x)/((4x+1)(4x-1)) = 0
    ⇔(2(4x -1))/((4x+1)(4x-1)) + (3(4x + 1))/((4x+1)(4x-1)) – (8 + 6x)/((4x+1)(4x-1))  = 0
    ⇔(8x – 2 + 12x + 3 – 8 – 6x )/((4x+1)(4x-1)) = 0
    ⇔(14x -7)/((4x+1)(4x-1))=0
    Do   (4x+1)(4x-1) \ne 0
    ⇒14x – 7 = 0
    ⇒ x = 1/2 ( tm)
    Vậy x = 1/2

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

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