1-(a²+8)/(a²+4a+4)÷(4a-4)/(a²+2a)
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1-(a²+8)/(a²+4a+4)÷(4a-4)/(a²+2a)
![1-(a²+8)/(a²+4a+4)÷(4a-4)/(a²+2a)](/uploads/image/z/19043436-12-6.jpg?t=1-%28a%26%23178%3B%2B8%29%2F%28a%26%23178%3B%2B4a%2B4%29%C3%B7%284a-4%29%2F%EF%BC%88a%26%23178%3B%2B2a%EF%BC%89)
1-(a²+8)/(a²+4a+4)÷(4a-4)/(a²+2a)
=[(a²+4a+4-a²-8﹚/﹙a²+4a+4﹚]×[﹙a²+2a﹚/﹙4a-4﹚]
=[(4a-4﹚/﹙a+2﹚²]×[a﹙a+2﹚/﹙4a-4﹚]
=a/(a+2)
=[(a²+4a+4-a²-8﹚/﹙a²+4a+4﹚]×[﹙a²+2a﹚/﹙4a-4﹚]
=[(4a-4﹚/﹙a+2﹚²]×[a﹙a+2﹚/﹙4a-4﹚]
=a/(a+2)
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