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

Toán Lớp 9: Tìm x (144/x-4) -(160/x+4) = 1/2

Toán Lớp 9: Tìm x
(144/x-4) -(160/x+4) = 1/2

Comments ( 2 )

  1. Giải đáp + giải thích các bước giải:
    144/(x-4)-160/(x+4)=1/2 (x\ne \pm4)
    ->(288(x+4)-320(x-4))/(2(x-4)(x+4))=((x-4)(x+4))/(2(x-4)(x+4))
    ->288x+1152-320x+1280=x^2-16
    ->-32x+2432=x^2-16
    ->x^2+32x-2448=0
    ->x^2-36x+68x-2448=0
    ->x(x-36)+68(x-36)=0
    ->(x+68)(x-36)=0
    ->\(\left[ \begin{array}{l}x=-68\\x=36\end{array} \right.(TM)\) 
    Vậy S={36;-68}

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