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

Toán Lớp 8: ` (x+1)/(x-2) + (4)/(x+2) + (6-5x)/(x^2-4) ` KHÔNG BỎ BƯỚC Ạ !

Toán Lớp 8: (x+1)/(x-2) + (4)/(x+2) + (6-5x)/(x^2-4)
KHÔNG BỎ BƯỚC Ạ !

Comments ( 1 )

  1. (x+1)/(x-2) + 4/(x+2) + (6-5x)/(x^2 -4 ) (dkxd: x$\neq$-2;2)
    ⇔ ((x+1)(x+2))/((x-2)(x+2))+(4(x-2))/((x-2)(x+2))+(6-5x)/((x-2)(x+2))
    ⇔ (x^2+3x+2)/((x-2)(x+2))+(4x-8)/((x-2)(x+2))+(6-5x)/((x-2)(x+2))
    ⇔ (x^2+3x+2+4x-8+6-5x)/((x-2)(x+2))
    ⇔ (x^2+2x)/((x-2)(x+2))
    ⇔ (x(x+2))/((x-2)(x+2))
    ⇔ x/(x-2)

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