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

Toán Lớp 8: `(x^(2)-9)/(2x+6) : (3-x)/(2)` Tính

Toán Lớp 8: (x^(2)-9)/(2x+6) : (3-x)/(2)
Tính

Comments ( 2 )

  1. Giải đáp:
    $\dfrac{x²-9}{2x+6}:\dfrac{3-x}{2}$
    $= \dfrac{(x-3).(x+3)}{2.(x+3)}.\dfrac{3-x}{2}$
    $= \dfrac{x-3}{2}.\dfrac{3-x}{2}$
    $= \dfrac{-x²+6x-9}{4}$
     

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