问题
填空题
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答案
原式=
-(a+2)2 (a+2)(a-2)
-(a-2)2 (a+2)(a-2) 8a (a+2)(a-2)
=a2+4+4a-a2-4+4a-8a (a+2)(a-2)
=0 (a+2)(a-2)
=0．
故答案为：0．
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原式=
-(a+2)2 (a+2)(a-2)
-(a-2)2 (a+2)(a-2) 8a (a+2)(a-2)
=a2+4+4a-a2-4+4a-8a (a+2)(a-2)
=0 (a+2)(a-2)
=0．
故答案为：0．