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

Toán Lớp 8: Thực hiện phép tính : a) 3 6 – x _____ + ________ 2x+6 2x^2 + 6x

Toán Lớp 8: Thực hiện phép tính :
a)
3 6 – x
_____ + ________
2x+6 2x^2 + 6x

Comments ( 2 )

  1. 3/(2x+6)+(6-x)/(2x^2+6x)
    =3/(2x+6)+(6-x)/(x(2x+6))
    =(3x+6-x)/(x(2x+6))
    =(2x+6)/(x(2x+6))
    =1/x
     

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

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