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

Toán Lớp 8: x^2-4/2x+6 . 2/2+x giúp tui với nha

Toán Lớp 8: x^2-4/2x+6 . 2/2+x giúp tui với nha

Comments ( 2 )

  1. Giải đáp:
    {x^2 – 4}/{2x + 6} . 2/{2 +x}
    = {(x – 2).(x + 2)}/{2.(x + 3)} . 2/{2 + x}
    = {2.(x – 2).(x + 2)}/{2.(x + 3).(2 + x)}
    = {\cancel{2}.(x – 2).\cancel{(x + 2)}}/{\cancel{2}.(x + 3).\cancel{(2 + x)}}
    = {x – 2}/{x + 3}
    ∘ dariana

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

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