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

Toán Lớp 8: $\frac{x+3}{x}$- $\frac{x}{x-3}$ +$\frac{9}{x^2-3x}$

Toán Lớp 8: $\frac{x+3}{x}$- $\frac{x}{x-3}$ +$\frac{9}{x^2-3x}$

Comments ( 2 )

  1. (x+3)/x-x/(x-3)+9/(x^2-3x)(x\ne0;x\ne3)
    =(x^2-9)/(x(x-3))-x^2/(x(x-3))+9(x(x-3))
    =(x+3(x-3)-x^2+9)/(x(x-3))
    =(x^2-9-x^2+9)/(x(x-3))
    =0/(x(x-3))
    =0

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