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

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

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

Comments ( 2 )

  1. Giải đáp:
    $\dfrac{2+x}{2-x}+\dfrac{4x^2}{4-x^2}+\dfrac{x-2}{2+x}$
    $=\dfrac{2+x}{2-x}+\dfrac{4x^2}{(2-x).(2+x)} +\dfrac{x-2}{2+x}$
    $=\dfrac{(2+x).(2+x)}{(2-x).(2+x)}+\dfrac{4x^2}{(2-x).(2+x)}+\dfrac{(x-2).(2-x)}{(2-x).(2+x)}$
    $=\dfrac{4+4x+x^2+4x^2-x^2+4x-4}{(2-x).(2+x)}$
    $=\dfrac{8x+4x^2}{(2-x).(2+x)}$
    $= \dfrac{4x.(2+x)}{(2-x).(2+x)}$
    $=\dfrac{4x}{2-x}$ 
     

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