约分8m-2m²/m²-16 x²-1/3-6x+3x²先化简分式（a+b)²-6（a+b)+9/(a+b)²-9再求值,其中a+b=-½

约分8m-2m²/m²-16 x²-1/3-6x+3x²先化简分式（a+b)²-6（a+b)+9/(a+b)²-9再求值,其中a+b=-½
约分8m-2m²/m²-16 x²-1/3-6x+3x²
先化简分式（a+b)²-6（a+b)+9/(a+b)²-9再求值,其中a+b=-½

约分8m-2m²/m²-16 x²-1/3-6x+3x²先化简分式（a+b)²-6（a+b)+9/(a+b)²-9再求值,其中a+b=-½
(8m-2m²)/(m²-16)
=2m(4-m) / (m+4)(m-4)
=-2m/(m+4)
(x²-1)/(3-6x+3x²)
=(x+1)(x-1) / 3(x-1)²
=(x+1)/3(x-1)