a²-4/a²+6a+9除a-2/2a+6,其中a=-5
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![a²-4/a²+6a+9除a-2/2a+6,其中a=-5](/uploads/image/z/1662838-70-8.jpg?t=a%26%23178%3B-4%2Fa%26%23178%3B%2B6a%2B9%E9%99%A4a-2%2F2a%2B6%2C%E5%85%B6%E4%B8%ADa%3D-5)
a²-4/a²+6a+9除a-2/2a+6,其中a=-5
a²-4/a²+6a+9除a-2/2a+6,其中a=-5
a²-4/a²+6a+9除a-2/2a+6,其中a=-5
(a²-4/a²+6a+9)/(a-2/2a+6)
=(a+2)(a-2)/(a+3)^2*2(a+3)/(a-2)
=2(a+2)/(a+3)
=2*(-5+2)/(-5+3)
=3