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

Toán Lớp 8: thực hiện phép tính( x/x-1)-(x+1/x-1)

Toán Lớp 8: thực hiện phép tính( x/x-1)-(x+1/x-1)

Comments ( 2 )

  1. ĐK: $x\ne 1$
    $\dfrac{x}{x-1}-\dfrac{x+1}{x-1}\\=\dfrac{x-(x+1)}{x-1}\\=\dfrac{x-x-1}{x-1}\\=\dfrac{-1}{x-1}\\=-\dfrac{1}{x-1}$
    Vậy $\dfrac{x}{x-1}-\dfrac{x+1}{x-1}=-\dfrac{1}{x-1}$ với $x\ne 1$

  2. text{đkxđ}   x \ne 1
    x/(x-1) – (x+1)/(x-1) = (x-(x+1))/(x-1) = (x-x-1)/(x-1) = (-1)/(x-1)
    CHÚC HOK TỐT AK

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