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

Toán Lớp 8: $\frac{6}{5x-20}$ ${-}$ $\frac{x-5}{x^2-8x+16}$

Toán Lớp 8: $\frac{6}{5x-20}$ ${-}$ $\frac{x-5}{x^2-8x+16}$

Comments ( 2 )

  1. Giải đáp + giải thích các bước giải:
    6/(5x – 20) – (x -5 )/(x^2 – 8x + 16) (x \ne 4)
    = 6/( 5(x -4) ) – (x – 5)/( (x – 4)^2)
    = ( 6(x – 4) – 5(x – 5) )/( 5(x – 4)^2)
    = ( 6x – 24 – 5x + 20)/( 5(x – 4)^2)
    = ( x – 4)/( 5(x – 4)^2)
    = 1/( 5(x – 4) )
    = 1/(5x – 20)
     

  2. Giải đáp + giải thích các bước giải:
    6/(5x – 20) – (x – 5)/(x^2 – 8x + 16)          (x $\neq$ 4)
    = 6/[5(x – 4)] – (x – 5)/(x – 4)^2
    = [6(x – 4)]/[5(x – 4)^2] – [5(x – 5)]/[5(x – 4)^2]
    = (6x – 24 – 5x + 25)/[5(x – 4)^2]
    = (x + 1)/[5(x – 4)^2]

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