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

Toán Lớp 9: tìm x 3/1-4x=2/4x+1-8+6x/16x^2-1

Toán Lớp 9: tìm x
3/1-4x=2/4x+1-8+6x/16x^2-1

Comments ( 2 )

  1. $\dfrac{3}{1-4x}=\dfrac{2}{4x+1}-\dfrac{8+6x}{16x^2-1} \left ( x \neq ± \dfrac{1}{4} \right )$
    $⇔\dfrac{-3(4x+1)}{(4x-1)(4x+1)}=\dfrac{2(4x-1)}{(4x+1)(4x-1)}-\dfrac{8+6x}{(4x+1)(4x-1)}$
    $⇒-3(4x+1)=2(4x-1)-(8+6x)$
    $⇔-12x-3=8x-2-8-6x$
    $⇔-12x-3=2x-10$
    $⇔2x+12x=-3+10$
    $⇔14x=7$
    $⇔x=\dfrac{1}{2}$ ( Thỏa mãn )
    Vậy phương trình có nghiệm $x=\dfrac{1}{2}$
     

  2. Giải đáp và giải thích các bước giải:
    ~kam~ 

    toan-lop-9-tim-3-1-4-2-4-1-8-6-16-2-1

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

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