问题
填空题
化简:a(a-1)2-(a+1)(a2-a+1)=______.
答案
a(a-1)2-(a+1)(a2-a+1),
=a(a2-2a+1)-(a3+1),
=a3-2a2+a-a3-1,
=-2a2+a-1.
化简:a(a-1)2-(a+1)(a2-a+1)=______.
a(a-1)2-(a+1)(a2-a+1),
=a(a2-2a+1)-(a3+1),
=a3-2a2+a-a3-1,
=-2a2+a-1.