计算:(a²-2a)/(a+4)·(a²+8a+16)/(4a²-8a).
问题描述:
计算:(a²-2a)/(a+4)·(a²+8a+16)/(4a²-8a).
答
(a²-2a)/(a+4)·(a²+8a+16)/(4a²-8a)
=a(a-2)/(a+4)·(a+4)²/4a(a-2)
=a+4/4
答
(a²-2a)/(a+4)·(a²+8a+16)/(4a²-8a)
=a(a-2)/(a+4)·(a+4)²/4a(a-2)
=(a+4)/4