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

Toán Lớp 7: $\frac{x-2}{x+3}$ = $\frac{x-3}{x+4}$ tìm x

Toán Lớp 7: $\frac{x-2}{x+3}$ = $\frac{x-3}{x+4}$
tìm x

Comments ( 2 )

  1. Giải đáp:
    (x-2)/(x+3) = (x-3)/(x+4)
    -> (x-2)(x+4)= (x+3)(x-3)
    -> x(x+4) – 2(x+4) = x(x-3) + 3(x-3)
    -> x^2+4x-2x-8 = x^2-3x+3x – 9
    -> x^2 + 2x – 8 = x^2 – 9  
    -> x^2 – x^2 + 2x – 8 = -9
    -> 2x – 8 = -9
    -> 2x = -9 + 8
    -> 2x = -1
    -> x = -1/2
    Vậy x = -1/2
     

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