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）-
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
已知a²-a-4=0,求a²-2（a²-a+3）-1/2(a²-a-4)-a的值
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