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

Toán Lớp 8: $\frac{-9x+18}{x^{2}-36}$ + $\frac{x}{x+6}$ + $\frac{x-3}{x-6}$

Toán Lớp 8: $\frac{-9x+18}{x^{2}-36}$ + $\frac{x}{x+6}$ + $\frac{x-3}{x-6}$

Comments ( 2 )

  1. (-9x+18)/(x^2 – 36) + x/(x+6) + (x-3)/(x-6)
    = (-9x+18)/((x-6)(x+6)) + x/(x+6) + (x-3)/(x-6)
    = (-9x+18)/((x-6)(x+6)) + (x(x-6))/((x-6)(x+6)) + ((x-3)(x+6))/((x-6)(x+6))
    = (-9x + 18 + x^2 – 6x + x^2 + 6x – 3x – 18)/((x-6)(x+6))
    = (2x^2 – 12x)/((x-6)(x+6))
    = (2x(x-6))/((x-6)(x+6))
    = (2x)/(x+6)
     

  2. Giải đáp:
    (-9x+18)/(x^2 – 36) + x/(x +6) + (x-3)/(x-6)(ĐK : x ≠ ± 6)$\\$= (-9x +18)/((x-6)(x +6)) + (x(x-6))/((x-6)(x+6)) + ((x-3)(x+6))/((x-6)(x+6))$\\$ = (-9x + 18+ x^2 – 6x+x^2 + 3x -18)/((x -6)(x+6))$\\$ = (2x^2 – 12x)/((x-6)(x+6))$\\$ = (2x(x-6))/((x-6)(x+6))$\\$= (2x)/(x+6)

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

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