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

Toán Lớp 8: Giúp nhanh vs ạ xin luôn í Thực hiện phép tính (x-3)/(x+2)+4x/(x-3)-(8x+4x^2)/(x^2-x-6)

Toán Lớp 8: Giúp nhanh vs ạ xin luôn í
Thực hiện phép tính (x-3)/(x+2)+4x/(x-3)-(8x+4x^2)/(x^2-x-6)

Comments ( 1 )

  1. \frac{(x-3)}{(x+2)}+\frac{4x}{(x-3)}-\frac{(8x+4x^2)}{(x^2-x-6)} (n \ne -2; n \ne 3)
    =\frac{(x-3)^2}{(x+2).(x-3)}+\frac{4x.(x+2)}{(x+2).(x-3)}-\frac{8x+4x^2}{(x+2).(x-3)}
    =\frac{x^2-6x+9+4x^2+8x-8x-4x^2}{(x+2).(x-3)}
    =\frac{x^2-6x+9}{(x+2).(x-3)}
    =\frac{(x-3)^2}{(x+2).(x-3)}
    =\frac{x-3}{x+2}
     

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