因式分解【a²+4²】-16a²
问题描述：
因式分解【a²+4²】-16a²
答
题目写错了吧,根据经验,应该是
( a" + 4 )" - 16a"
= ( a" + 4 )" - ( 4a )"
= ( a" - 4a + 4 )( a" + 4a + 4 )
= ( a - 2 )"( a + 2 )"