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

Toán Lớp 8: Thực hiên phép tính: 2x-2/x^2-4 + 1/x-2 – 3x/x+2 LM nhanh giúp mik zới !!

Toán Lớp 8: Thực hiên phép tính:
2x-2/x^2-4 + 1/x-2 – 3x/x+2
LM nhanh giúp mik zới !!

Comments ( 1 )

  1. (2x – 2)/(x^2 – 4) + 1/(x – 2) – (3x)/(x + 2)
    = (2x – 2)/( (x – 2)(x + 2) ) + (x + 2)/( (x – 2)(x + 2) ) – ( 3x(x – 2) )/( (x – 2)(x + 2) )
    = (2x – 2 + x + 2 – 3x^2 + 6x)/( (x – 2)(x + 2) )
    = (-3x^2 + 9x)/( (x – 2)(x + 2) )
    = (9x – 3x^2)/(x^2 – 4)
     

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

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