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

Toán Lớp 8: $\frac{2}{x}$ + $\frac{3}{x-1}$ – $\frac{1-4x}{x^{2}-x }$

Toán Lớp 8: $\frac{2}{x}$ + $\frac{3}{x-1}$ – $\frac{1-4x}{x^{2}-x }$

Comments ( 2 )

  1. 2/x + 3/(x-1) – (1-4x)/(x^2 -x)
    = (2(x-1) )/(x(x-1)) + (3x)/(x(x-1)) – (1-4x)/(x(x-1))
    = (2x -2)/(x^2 -x) + (3x)/(x^2 -x) – (1-4x)/(x^2 -x)
    = (2x -2 +3x -1 +4x)/(x^2 -x)
    = (9x -3)/(x^2 -x)

  2. Giải đáp:
    = {9x – 3}/{x^2 – x}
    Lời giải và giải thích chi tiết:
    2/x + 3/{x – 1} – {1- 4x}/{x^2 – x}
    = 2/x + 3/{x – 1} – {1- 4x}/{x(x – 1)}
    = {2(x – 1)}/{x(x – 1)} + {3x}/{x(x – 1)} – {1- 4x}/{x(x – 1)}
    = {2x -2}/{x(x – 1)} + {3x}/{x(x – 1)} – {1- 4x}/{x(x – 1)}
    = {2x – 2 + 3x – (1 – 4x)}/{x(x – 1)}
    = {2x – 2 + 3x – 1 + 4x}/{x(x – 1)}
    = {(2x + 3x + 4x) – (2 + 1)}/{x(x – 1)}
    = {9x – 3}/{x(x – 1)} = {9x – 3}/{x^2 – x}
    #SunHee

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

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