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

Toán Lớp 8: `2/2x + 1` – `1/2x-1` + `2/4x^2 – 1`

Toán Lớp 8: 2/2x + 1 – 1/2x-1 + 2/4x^2 – 1

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết :
      2/2x + 1 – 1/2x – 1 + 2/4x^2 – 1
    = (x – 1/2x) + (1 – 1) + 1/2x^2 -1
    = (2x – x)/2 + 1/2x^2 – 1
    = x/2 + x^2/2 – 1
    = (x^2 + x)/2 -1
    = (x^2 + x -2)/2
     

  2. Gửi bạn:
    $\dfrac{2}{2}x+1-\dfrac{1}{2}x-1+\dfrac{2}{4}x^2-1$ 
    $=x+1-\dfrac{1}{2}x-1+\dfrac{1}{2}x^2-1$ 
    $=\dfrac{1}{2}x+\dfrac{1}{2}x^2-1$ 
    $=\dfrac{x+x^2}{2}-1$ 
    $=\dfrac{x+x^2-2}{2}$ 

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