[Toán 8]Tính

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$\dfrac{3x + 6}{2x + 4}. \dfrac{8 - 4x}{x + 2} = \dfrac{3(x + 2). 4(2 - x)}{2(x + 2)^2} = \dfrac{-12(x + 2)(x - 2)}{2(x + 2)^2} = \dfrac{- 6(x - 2)}{x + 2}$
 
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