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

Toán Lớp 8: Thực hiện phép tính $\frac{4}{x+3}$ +$\frac{x+27}{x^2-9}$

Toán Lớp 8: Thực hiện phép tính
$\frac{4}{x+3}$ +$\frac{x+27}{x^2-9}$

Comments ( 2 )

  1. Giải đáp:
     #Clickbim 
    $\dfrac{4}{x+3}$ + $\dfrac{x+27}{x²-9}$  (ĐK : x \ne +-3) 
    = $\dfrac{4}{x+3}$ + $\dfrac{x+27}{(x-3)(x+3)}$
    = $\dfrac{4(x-3)}{(x-3)(x+3)}$ + $\dfrac{x+27}{(x-3)(x+3)}$
    = $\dfrac{4x-12+x+27}{(x-3)(x+3)}$
    =$\dfrac{(4x+x)+(-12+27)}{(x-3)(x+3)}$
    = $\dfrac{5x+15}{(x-3)(x+3)}$
    = $\dfrac{5(x+3)}{(x-3)(x+3)}$
    = $\dfrac{5}{x-3}$
    Lời giải và giải thích chi tiết:
     

  2. $\dfrac{4}{x+3}+\dfrac{x+27}{x^2-9}$
    $=\dfrac{4\left(x-3\right)}{\left(x+3\right)\left(x-3\right)}+\dfrac{x+27}{\left(x+3\right)\left(x-3\right)}$
    $=\dfrac{4\left(x-3\right)+x+27}{\left(x+3\right)\left(x-3\right)}$
    $=\dfrac{5x+15}{\left(x+3\right)\left(x-3\right)}$
    $=\dfrac{5}{x-3}$
     

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