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

Toán Lớp 8: x trên x – 3 + 9 – 6x trên x² – 3x giúp mình với

Toán Lớp 8: x trên x – 3 + 9 – 6x trên x² – 3x giúp mình với

Comments ( 2 )

  1. Gửi bạn:
    $\dfrac{x}{x-3}+\dfrac{9-6x}{x^2-3x}$ 
    $=\dfrac{x}{x-3}+\dfrac{9-6x}{x(x-3)}$ 
    $=\dfrac{x.x}{x(x-3)}+\dfrac{9-6x}{x(x-3)}$ 
    $=\dfrac{x^2}{x(x-3)}+\dfrac{9-6x}{x(x-3)}$ 
    $=\dfrac{x^2-6x+9}{x(x-3)}$ 
    $=\dfrac{(x-3)^2}{x(x-3)}$ 
    $=\dfrac{x-3}{x}$ 

  2. x/(x-3) + (9-6x)/(x^2-3x)
    =x/(x-3) + [3.(3-2x)]/[x.(x-3)]
    = (x^2+9-6x)/[x.(x-3)]
    = [(x-3)^2]/[x.(x-3)]
    =(x-3)/x

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