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

Toán Lớp 8: Chỉ là muốn mn giúp :( ($\frac{9}{x³-9x}$ +$\frac{1}{x+3}$ ) : ( $\frac{x-3}{x²+3x}$ – $\frac{x}{3x+9}$ )

Toán Lớp 8: Chỉ là muốn mn giúp 🙁
($\frac{9}{x³-9x}$ +$\frac{1}{x+3}$ ) : ( $\frac{x-3}{x²+3x}$ – $\frac{x}{3x+9}$ )

Comments ( 2 )

  1. (9/(x^3-9x)+1/(x+3)):((x-3)/(x^2+3x)-x/(3x+9))(x\ne0;x\ne+-3)
    =[9/(x(x-3)(+3))+(1.x(x-3))/((x+3)x(x-3))][((x-3).3)/(3x(x+3))-(x.x)/(3(x+3).x)]
    =(9+x^2-3x)/(x(x-3)(x+3)):(-x^2+3x-9)/(3x(x+3))
    =(9+x^2-3x)/(x(x-3)(x+3)) . (3x(x+3))/(-x^2+3x-9)
    =3/(-(x-3))
    =3/(3-x)

  2. U\omegaU
    Giải đáp:
    \frac{3}{3-x}
    Lời giải và giải thích chi tiết:
    \frac{9}{x³-9x} +\frac{1}{x+3} : \frac{x-3}{x²+3x} – \frac{x}{3x+9}
    =\frac{9+3(x-3)}{x(x-3)(x+3)} : \frac{3(x-3)-x²}{2x(x+3)}
    =\frac{x²-3x+9}{x(x-3)(x+3)} . \frac{3x(x+3)}{-x²+3x-9}
    =\frac{3}{3-x}

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

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