已知a²-a-4=0,求a²-2(a²-a+3)-1/2(a²-a-4)-a的值
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已知a²-a-4=0,求a²-2(a²-a+3)-1/2(a²-a-4)-a的值
![已知a²-a-4=0,求a²-2(a²-a+3)-1/2(a²-a-4)-a的值](/uploads/image/z/16589589-69-9.jpg?t=%E5%B7%B2%E7%9F%A5a%26%23178%3B-a-4%3D0%2C%E6%B1%82a%26%23178%3B-2%EF%BC%88a%26%23178%3B-a%2B3%EF%BC%89-1%2F2%28a%26%23178%3B-a-4%29-a%E7%9A%84%E5%80%BC)
a²-a-4=0
a²-a=4
a²-2(a²-a+3)-1/2(a²-a-4)-a
=a²-2a²+2a-6-a
=-a²+a-6
=-(a²-a)-6
=-4-6
=-10
a²-a=4
a²-2(a²-a+3)-1/2(a²-a-4)-a
=a²-2a²+2a-6-a
=-a²+a-6
=-(a²-a)-6
=-4-6
=-10
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