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

Toán Lớp 8: Rút gọn biểu thức C: $\frac{2x-x bình}{4-x bình}$ + $\frac{x bình-2x+4}{x mũ 3+8}$

Toán Lớp 8: Rút gọn biểu thức C:
$\frac{2x-x bình}{4-x bình}$ + $\frac{x bình-2x+4}{x mũ 3+8}$

Comments ( 2 )

  1. Gửi bạn:
    $ĐKXĐ:x\neq-2,2$
    $\dfrac{2x-x^2}{4-x^2}+\dfrac{x^2-2x+4}{x^3+8}$ 
    $=\dfrac{x(2-x)}{(2-x)(2+x)}+\dfrac{x^2-2x+4}{(x+2)(x^2-2x+4)}$ 
    $=\dfrac{x}{x+2}+\dfrac{1}{(x+2)}$ 
    $=\dfrac{x+1}{x+2}$ 

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