(a-3)²-a(a-2)
问题描述:
(a-3)²-a(a-2)
答
=a²-6a+9-(a²-2a)
=a²-6a+9-a²+2a
=-4a+9
(a-3)²-a(a-2)
=a²-6a+9-(a²-2a)
=a²-6a+9-a²+2a
=-4a+9