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

Toán Lớp 8: (x/x-3)-(2/x+3)-[x-(1-x)/9-x2]

Toán Lớp 8: (x/x-3)-(2/x+3)-[x-(1-x)/9-x2]

Comments ( 2 )

  1. ($\frac{x}{x-3}$-$\frac{2}{x+3}$)-( $\frac{x-(1-x)}{9-x^2}$)
    =$\frac{x(x+3)}{(x-3)(x+3)}$-$\frac{2(x-3)}{(x-3)(x+3)}$-$\frac{x-(1-x)}{9-x^2}$ 
    =$\frac{x(x+3)-2(x-3)}{(x-3)(x+3)}$-$\frac{x-(1-x)}{9-x^2}$ 
    =$\frac{x^2+3x-2x+6}{(x-3)(x+3)}$-$\frac{x-(1-x)}{9-x^2}$ 
    =$\frac{x+6+x^2}{(x-3)(x+3)}$- $\frac{x-(1-x)}{(x-3)(-x-3)}$ 
    =$\frac{x+6+x^2}{(x-3)(x+3)}$- $\frac{-(x-(1-x))}{(x-3)(x+3)}$ 
    =$\frac{x+6+x^2-(-(x-(1-x))}{(x-3)(x+3)}$ 
    =$\frac{x+6+x^2+x+x-1}{(x-3)(x+3)}$ 
    =$\frac{3x+5+x^2}{(x-3)(x+3)}$ 
    =$\frac{3x+5+x^2}{x^2-9}$ 
    Giải đáp:
     
    Lời giải và giải thích chi tiết:
     

  2. $\text{Giải đáp và giải thích các bước giải:}$
    $\frac{x}{x-3}-\frac{2}{x+3}-[\frac{x-(1-x)}{9-x^2}]$
    $=\frac{x(x+3)}{(x-3)(x+3)}-\frac{2(x-3)}{(x-3)(x+3)}-\frac{x-1+x}{-(x-3)(x+3)}$
    $=\frac{x^2+3x}{(x-3)(x+3)}-\frac{2x-6}{(x-3)(x+3)}+\frac{2x-1}{(x-3)(x+3)}$
    $=\frac{x^2+3x-2x+6+2x-1}{(x-3)(x+3)}$
    $=\frac{x^2+3x+5}{x^2-9}$

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

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