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

Toán Lớp 8: $\frac{x+6}{x ²-4}$-$\frac{2}{x(x+2)}$

Toán Lớp 8: $\frac{x+6}{x ²-4}$-$\frac{2}{x(x+2)}$

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    $\dfrac{x+6}{x^2-4}-$$\dfrac{2}{x(x+2)}$
    $=^{}$$\dfrac{x+6}{x^2-2^2}-$$\dfrac{2}{x(x+2)}$
    $=^{}$$\dfrac{x+6}{(x+2)(x-2)}-$$\dfrac{2}{x(x+2)}$
    $=^{}$$\dfrac{x(x+6)}{x(x+2)(x-2)}-$$\dfrac{2(x-2)}{x(x+2)(x-2)}$
    $=^{}$$\dfrac{x(x+6)-2(x-2)}{x(x+2)(x-2)}$
    $=^{}$$\dfrac{x^2+6x-2x+4}{x(x+2)(x-2)}$
    $=^{}$$\dfrac{x^2+4x+4}{x(x+2)(x-2)}$
    $=^{}$$\dfrac{(x+2)^2}{x(x+2)(x-2)}$
    $=^{}$$\dfrac{x+2}{x(x-2)}$
    chúc bạn học tốt

  2. Giải đáp:
    ( x + 2 )/( x . ( x – 2 ))
    Lời giải và giải thích chi tiết:
    ( x + 6 )/( x^2 – 4 ) – 2/( x . ( x + 2 )) ( Điều kiện : x $\neq$ 0 ; x $\neq$ ± 2 )
    = ( x + 6 )/( x^2 – 2^2 ) – 2/( x . ( x + 2 ))
    = ( x + 6 )/(( x – 2 )( x + 2 )) – 2/( x . ( x + 2 ))
    = ( (x + 6) . x )/( x . ( x – 2 )( x + 2 )) – ( 2 . ( x – 2 ))/( x . ( x + 2 ) . ( x – 2 ))
    = ( x^2 + 6x )/( x . ( x – 2 )( x + 2 )) – ( 2x – 4 )/( x . ( x – 2 )( x + 2 ))
    = ( x^2 + 6x – 2x + 4 )/(x . ( x – 2 )( x + 2 ))
    = ( x^2 + 4x + 4 )/(x . ( x – 2 )( x + 2 ))
    = ( x^2 + 2 . x . 2 + 2^2 )/(x . ( x – 2 )( x + 2 ))
    = ( ( x + 2 )^2 )/(x . ( x – 2 )( x + 2 ))
    = ( ( x + 2 )^2 : ( x + 2 ) )/(x . ( x – 2 )( x + 2 ) : ( x + 2 ))
    = ( x + 2 )/( x . ( x – 2 ))
    Vậy ( x + 6 )/( x^2 – 4 ) – 2/( x . ( x + 2 )) = ( x + 2 )/( x . ( x – 2 ))

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

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