Phân tích. ( x - 1 ) (x + 2)

1 / ( x - 1 ) (x + 2) 2 / ( x - 3 ) ( x + 2 ) 3 / ( x - 5 ) (x - 1 ) 4 / ( x + 1 ) ( x -2 ) 5 / ( x - 8 ) ( x - 1 )